6600GT will run it on fairly high settings, better than the 9800pro. Nvidia perform
much better in that game than ATi.
The 6600GT also has Purevideo enabled, which allows the card to take strain off the CPU when streaming/editing etc.
It's just a case of whether you want to spend $10-20 more for a card which performs better.

fedz
edit: this 6600GT is fabulous. It's a VIVO edition too...
http://www.newegg.com/app/ViewProduc...127-150&depa=0