What kind of question is that? unfortunetely, the 9800PRO is still a contender, and it is going to be hard to make that card go away. It's a killer card, but NVidia kicks ass. I would say the 6600GT. The absence of GDDR3 in the ATI is one of the winning factors for the 6600GT, and the presence of PS 3.0 in the NVidia.
Let us not let this become a flame war for fanboys. Please, no stupid fanboy comments.