Primaries

SMG's
MP5K: Default
Scorpion: Level 7
MAC-11: Level 11
AK-74u: Level 17
Uzi: Level 23
PM63: Level 28 or 29
MPL: Level 35
Spectre: Level 41
Classified=Kiparis: All SMG's bought, so at least Level 41, cause you need the Spectre.

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Shotgun's
Olympia: Default
Stakeout: < 25
SPAS: Level 31
Classified=HS-10: All Shotgun's bought, so at least Level 31, cause you need the SPAS.

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AR's
M16: Default
Enfield: Level 4
M14: Level 9
Famas: Level 14
Galil: Level 20
AUG: Level 26
FN FAL: Level 32
AK-47: Level 36/38
Commando: Level 44
Classified=G11: All AR's bought, so at least Level 44, cause you need the Commando.

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LMG's
HK21:Default
RPK: < 6
M60: < 25
Classified=Stoner(?): All LMG's bought, so at least Level (<25), cause you neet the M60

Snipers
Dragunov: Default
WA2000: < 25
L96: Level 31(?)
Classified=PSG1: All Sniper's bought, so at least Level 31(?), cause you need the L96.

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Extras on gun
Camo: Level 22
Reticule shape: Level 25
Reticule color: Level 25
Lens: Level 30
Clan Tag (In your gun): Level 10/19
Emblem (In your gun): Level 16/18

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Secondaries
Pistols
ASP: Default
M1911: Probably Default or <6
Makarov: Same as above ^^
Python: Level 16/18
Classified=CZ75: All pistols bought, so at least Level 16/18, cause you need the Python.

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Launchers
M72 LAW: Default
RPG: Level 12
Sterla: Unknown
China Lake: level 48

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Special
Ballistic Knife: Level 15
Crossbow: Level 33

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Facepaint: Level 31


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Perks


Lightweight & Lightweight Pro
Ability: Allows you to move faster, but how fast depends on the equipped weapons mobility. This should be used with a "run and gun" class due to the added speed.

Pro Ability: No falling damage.

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Scavenger & Scavenger Pro
Ability: Replenishes your ammunition and lethal grenades when you walk over blue scavenger bags that are dropped by dead players. This won't resupply launchers or equipment. Scavenger is very useful with weapons that run out of ammo quickly.

Pro Ability: Doubles your starting ammo with extra magazines. This also replenishes your tactical grenades.

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Ghost & Ghost Pro
Ability: Ghost works pretty much like Cold Blooded from Modern Warfare 2. You are undetectable by the Spy Plane killstreak when you have this equipped. You show up on the radar if you fire a weapon that doesn't have a silencer.

Pro Ability: Undetectable by aircraft, infrared and sentries. Enemies won't see your name or a red crosshair when targeting you

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Flak Jacket & Flak Jacket Pro
Ability: Flak Jacket greatly reduces explosive damage and allows you to survive any indirect explosive attack. Explosive crossbow bolts are lethal if they get stuck on you and explode.

Pro Ability: Deflects fire damage and allows you to reset the fuse of a thrown grenade when you pick it up.

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Hardline & Hardline Pro
Ability: Reduces the amount of kills required for any killstreak by one. For example, the Care Package normally requires 5 kills, but if you have Hardline equipped you only need 4 kills.

Pro Ability: Allows you to randomly choose another reward from a Care Package. When you open a Care Package, you can either take the reward or try again for something better

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Hardened & Hardened Pro
Ability: Increases your weapons bullet penetration, but it doesn't increase bullet damage. This is pretty much like Deep Impact from Call of Duty 4 and FMJ weapon attachment from Modern Warfare 2.

Pro Ability: Your weapons do extra damage to aircraft and turrets. This also reduces flinch when you are shot by someone

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Scout & Scout Pro
Ability: Enables you to hold your breath longer when steadying a weapons scope. Scout offers a significant advantage to sniper class weapons.

Pro Ability: Allows you to switch your weapon faster

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Steady Aim & Steady Aim Pro
Ability: Steady Aim increases a weapons hip fire accuracy and also reduces shotgun spread. This should be used with the Dual Wield attachment, since Dual Wield significantly reduces a weapons hip fire accuracy.

Pro Ability: When equipped, this enables you to aim faster after sprinting and recover faster from a knife lunge.

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Sleight of Hand & Sleight of Hand Pro
Ability: Gives a faster reload time by reducing your weapons reload time in half. This is extremely useful with weapons that have long reload times, like shotguns and light machine guns.

Pro Ability: Allows you to aim down the sight ~50% faster than normal. This doesn't work with weapons that have scopes

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Warlord & Warlord Pro
Ability: This is the equivalent of Bling from Modern Warfare 2. Warlord allows you to put 2 attachments to your primary weapon. Stealth classes should use this since they can equip a silencer to remaining undetected and still reap the benefits of having a second attachment. This perk is likely to return in Modern Warfare 3 multiplayer since the mw3 perks list consists of familiar perks from previous Call of Duty games.

Pro Ability: You start with one extra lethal and tactical grenade, except smoke (WILLY PETE).

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Tactical Mask & Tactical Mask Pro
Ability: Protects you against NOVA GAS.

Pro Ability: Tactical Mask Pro reduces the effects of flashbangs and concussion grenades, it also reveals the position of a flashed or stunned enemy.

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Marathon & Marathon Pro
Ability: This extends your sprint time, but it doesn't increase your speed.

Pro Ability: Gives you unlimited sprint

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Ninja & Ninja Pro]
Ability: Ninja allows you to walk, sprint and jump almost silently, therefore you can sneak behind enemies more easily. This is the equivalent of Dead Silence from Call of Duty 4 and MW3.

Pro Ability: When you have this equipped enemies will be louder, it also makes you completely silent.

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Second Chance & Second Chance Pro
Ability: Gives you the ability to survive a normal death by dropping you to the ground. You can use your pistol to defend yourself from enemies. Second Chance ends after 10 seconds or if you take a single hit from the enemy, and in both cases, you will die. This perk won't be featured in MW3.

Pro Ability: If you have Second Chance Pro equipped you can survive a little longer than normal. Teammates can also revive you - even players that don't have Second Chance. You can see a white REVIVE tag above a player that can be revived.

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Hacker & Hacker Pro
Ability: Allows you to see enemy explosives, equipment and Tactical Insertions. This highlights them with a red color like SitRep from Modern Warfare 2.

Pro Ability: This is one of the most interesting additions to the whole Black Ops perks list. Hacker Pro actually allows you to sabotage enemy Care Packages and also turn enemy equipment friendly. This also makes you invisible to Motion Sensors


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KillStreaks
3Kills
Spy Plane

Description: This deploys a Spy Plane that shows enemies on the radar. The map is refreshed every 3-4 seconds. The Spy Plane flies around the map and can be shot down even with your primary weapon.

Players using the Ghost perk won't show up on the radar.

Unlocked by default.

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RC-XD

Description: This killstreak allows you to remote control a small miniature car with explosives. The explosion is big enough to take out a few bad guys that are grouped together.

The RC-XD moves really fast and can go up stairs. It can be destroyed by the enemy.

Unlocked: 1200 CoD Points

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4 Kills
Counter-Spy Plane

Description: Disables the enemy radar for a short period of time, even if they don't have a Spy Plane in the air.

Unlocked: 1600 CoD Points

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SAM Turret

Description: Airdrops a placeable SAM turret that engages enemy aircraft. With this you don't need to carry a rocket launcher around.

Unlocked: 1600 CoD Points

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5 Kills
Care Package

Description: This works just like in Modern Warfare 2, but this time a slow moving Chinook brings in the package. It's possible to shoot it down more easily due to its low altitude and speed. The Care Package itself contains a random killstreak or ammo.

There are two exclusive weapons that can only be found inside a Care Package: "Grim Reaper" Rocket Launcher and "Death Machine" Minigun. Care Packages can be seen on the radar by everyone: if it's red, it belongs to the enemy team. Care Packages can be booby trapped with the Hacker Pro perk.

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Napalm Strike

Description: The Napalm Strike is an airstrike that covers an area with slowly burning napalm.

Unlocked: 2400 CoD Points

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6 Kills
Sentry Gun

Description: Airdrop a placeable Sentry Gun that attacks enemy players. It can be temporarily disabled with concussion grenades.

Sentry Guns are most effective when placed in high places.

Unlocked: 3200 CoD Points

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Mortar Team

Description: Allows you to target 3 locations on the map that will be bombarded with Mortar Strikes.

Unlocked: 3200 CoD Points

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7 Kills
Attack Helicopter

Description: Deploys the classic Cobra Attack Helicopter to engage enemies, just like in the previous Call of Duty games. You can select the area where the helicopter is deployed. It's expected that the mw3 kill streak rewards system will feature a modified version of the Attack Helicopter. Modern Warfare 3 (MW3) should also feature many of the same killstreaks from Call of Duty: Black Ops and Modern Warfare 2, but with new enhancements and features.

Unlocked by default

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Valkyrie Rockets

Description: The Valkyrie Rockets are brought into the map in a Care Package that you have to pick up. You get 2 rockets. Valkyrie Rockets are controlled in 1st person (see the 2nd picture below) and can be controlled in all directions, but they have limited fuel that's indicated by a green bar.

You can boost a rocket to give it extra speed and also detonate it whenever you want. They are also hard to control, but the rocket has a moderate explosion radius, so you don't need a direct hit to kill an enemy.

Unlocked: 4000 CoD Points

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8 Kills
Blackbird

Description: Deploys a SR-71 Blackbird to monitor the map. You can see both enemy position and direction on the radar. The Blackbird doesn't have a refresh rate like the Spy Plane, so you can see the enemies in real-time until the Blackbird leaves the map.

The SR-71 Blackbird can't be shot down. Note: players using the Ghost perk will show up on the radar.

Unlocked: 4500 CoD Points

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Rolling Thunder

Description: Calls in a plane to carpet bomb the selected area. This is pretty much the Stealth Bomber killstreak reward from Modern Warfare 2 (Xbox 360, PS3 and PC).

Unlocked: 4500 CoD Points

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9 Kills
Chopper Gunner

Description: Be the gunner of an attack helicopter. You can attack enemies with a minigun from the side of the helicopter that enters the map.

Unlocked: 5000 CoD Points

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11 Kills
Attack Dogs

Description: This killstreak will spawn dogs to hunt enemy players on the map. Dogs can kill a player with one bite, so they should be killed as quickly as possible.

Unlocked: 6000 CoD Points

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Gunship

Description: The gunship (helicopter) is fully controllable by the player. You can use both the minigun and rockets to kill enemies.

Unlocked: 6000 CoD Points

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Credit to -JawnFlames-