60GB will do just fine.

It all depends on what you plan on doing with your J-TAG. If you just want to mod MW3, then 60GB is enough. But if you plan on backing up and playing games from your hard drive, you may need more.

yes that is plenty of memory..

To put it in terms of how many games 60 gb can hold may be about 10 given they are small games. If their each about 7 gbs, that's about 8 games obviously. If this works for you, it's a good size. I personally use about 500 gbs because I have a lot of games.

well, im buying this jtag, for the call of duty series, i dont know if its possible to mod zombies, id love to do that, im new to all this, are they easy to use? I see alot of patch downloads, how do you use them? And what happens when the new dashboard comes out?

For general homebrew and maybe 3 or 4 games installed to your HDD, 60GB is just fine, now if you are downloaded dozens of games, you may want to go a lot higher.

For instance, I have a 1TB external HDD that I have 30+ games installed to, and still have over 800GB left to put whatever I want on.

It toatlly depends on what you wanna do with your jtag or what you wanna put on your hard drive so i think 60gb would be fine