from my experience wit ATI and Nvidia cards id say ill go for geforce, they seem to b da better deal, and especially when u match up 6600 and 9800, 9800 been out for quite a while now.. if u can try gettin pci-express for da 6600
The cards have fairly even performance ceilings with the ATi card benifiting much more per memory clock. This of course is compensated by the fact that it is a refurbished card
