Cpu or video card

depends on game you played and work you do on your computer. if only playing games, better put on your money for more graphic. but if you do some heavy stuff like video encoding, better get quad or i7..
 
If you had money for both, you wouldn't be asking. Since you have to pick one, put more of your $$$ into GPU and OC the CPU as far as you can. I got the $1K CPU and the $500 GPU, the CPU is at ~20% load. If I had to do it over again, I'd get a $300 CPU, $200 water cooling kit, and three NVIDIA 285 cards.