Wow that build id all over the place

First: 1000W is waaay overkill
Second: ATI cards (in my opinion) are better and you can get 2 HD5870s for the same price as a 570
Thirdly: if you want to use this for gaming you defiantly DONT want a green drive as they are slow data acess, and mainly for backups
Lastly the 800d case is HUGE and unless your getting an extended motherboard save yourself the money. (also you can get closed loop liquid cooling with the money you save)

My build would be:

Coolermaster HAF 922 Case - Black
Gigabyte GA-X58A-UD5 Intel X58 (Socket 1366) DDR3 Motherboard
Intel Core i7 950 3.06GHz (Bloomfield) (Socket LGA1366) - Retail
Corsair Professional Series Gold AX850
Pioneer BDR-205 12x BluRay RW / 16x DVDRW Drive - Black (OEM)
Patriot Viper 2 Sector 7 6GB (3x2GB) PC3-12800C8 1600MHz Triple Channel Memory Kit
Microsoft Windows 7 Home Premium 64-Bit - OEM
Razer BlackWidow Expert Mechanical Gaming Keyboard
Logitech G500 Gaming Mouse
Corsair Hydro H70 High-Performance CPU WaterCooler
2x MSI ATI Radeon HD 5850 Twin FrozR II 1024MB GDDR5
Western Digital Caviar Black 1TB SATA 6Gb/s 64MB Cache
Arctic Silver 5 Thermal Compound (3.5g)
Dell UltraSharp U2410 24" Widescreen LCD Monitor

Alright this is what i'd have but of course you can not take my advice, but this should be more stable

i agree the psu is overkill although highly upgradable for the future, yes but the 570 is a good gpu with over 70 FPS on most games, yes i know; a caviar black would be better with a ssd boot drive, i was trying to keep the limit to 2000 GBP, the GA-X58A-UD5 is bigger than a standard atx board, therefore the case would be perfect for the board.
thanks for the comment though bro, peoples opinions will differ through their experience.