i built a super cheap gaming pc for myself a few months ago.

amd 64 3200 939, easily OC'ed it to 2.4 ghz ~ $45

asus a8r-mvp mobo ~ $60

1gb ddr400 ~ $50, ebay's the best place to find ram

ati x700 pro 256 mb ~ $50

450w psu ~ $15

40gb HD ~ $30

windows xp ~ my old cd key was accepted

reused my old pc case, monitor, keyboard, and speakers

total was about $250 including shipping

this is probably the cheapest you can go. im using this till i can save up enough money to buy a decent gaming rig

i get around 50 fps with BF2 on high settings with dynamic shadows and lighting off. i also got stalker and it runs smoothly with medium settings