Why does everybody still consider the 9800 Pro! That card is completely outdated now. Its like nobody has even heard of the X800 series, although i would still prefer the 6600 GT to any of the X800s.
actually if your thinking of going with the 6600GT, you should go with the 6800 if the 6600GT is to high of a price, and unlock the 4 additional pipelines and vertex shader. to reach a total of 16 pipelines and 6 vertex shader(is it 6?) and your be on your way.