What kind of computer costs less than or 700$ but can run games like Bulletstorm or Crysis 2 on medium - high?

I really want a computer centered on gaming. I love video games, but, consoles aren't doing it for me. There are tons of games I want to play that are either PC exclusive, more fun on PC, or have awesome mods which consoles don't have. I'd like it to be under 1,000$, though I rather it be 700 or less.What kind of computer costs less than or 700$ but can run games like Bulletstorm or Crysis 2 on medium - high?
Power supply Unit: 800 watt. (Just in case you want to add more hardware)

Motherboard. Somthing that supports AM3 socket and DDR3 ram (1333 or higher)

RAM: Corsair XMS DDR3 (4x 2Gb chips)

CPU: Quad Core - 3.2ghz (I would say 6 core, but for price, and a lot of games cannot yet make use of the extra processing power.)

Hard Drive: Anything above 500gb. (Hitachi drives are VERY reliable)

DVD R/W: Cause everyone has one.

Case: Any case that will fit a large motherboard.

OS: MAKE SURE TO GET 64 bit OS. (or you won't be able to use your extra RAM) What choice do you have? Windows 7. (upgrade from vista for 129 dollars )

NOTE: you will not likely be able to BUY a PC with all this cool stuff loaded. You may have to BUILD the PC yourself. (which is way more fun.)

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