Which Video Card is suitable for my computer?

I don't know which video card is the most suitable for my computer, so please help me!

Here is my computer specs:

Core 2 Quad Q6600

Ram 2GB

520W Power supply

Mainboard Gigabyte P35-DS3P

Windows Vista Ultimate 32 bit

And I want to play some high-end gameslike Crysis, Haze or Bioshock...

ATi's card is cheaper and faster than the 8800 GTS (HD 2900) so go with that one.BounceDK

The HD 2900 is faster, but it is NOT cheaper. The 8800GTS 320MB is your best deal for that system.

Any gretaa one, no matter which you buy it will be a bottleneck..

ATi's card is cheaper and faster than the 8800 GTS (HD 2900 or is it 2600?) so go with that one. Granted, I haven't had an ATi card in years but numerous benchmarks don't lie.BounceDK

Look @ his PSU. It's 520W & it's not enough for a HD 2900XT I think. So the best thing is 8800GTS 640MB or 320MB

[QUOTE="BounceDK"]ATi's card is cheaper and faster than the 8800 GTS (HD 2900 or is it 2600?) so go with that one. Granted, I haven't had an ATi card in years but numerous benchmarks don't lie.LahiruD

Look @ his PSU. It's 520W & it's not enough for a HD 2900XT I think. So the best thing is 8800GTS 640MB or 320MB