$500 gaming pc build.

[UnderwaterMadman]

http://www.tomshardware.com/reviews/cpu-graphic-game,1810.html

Decent build, I would probably swap out the video card for a 9600gt.

 

[plasticbathmonki]

Swap the processor out as well, if the mobo can handle something better.

 

[UnderwaterMadman]

Of course, if you can budget in a better processor go for it.