Upgraded video card I can get with my MB?

I have a M2N32-SLI Delux http://usa.asus.com/product.aspx?P_ID=0j… and was wondering whats a great video card capable to use on it, I currently have a Nvidia 8800GT OC. And my CPU is Blakc edition AMD Athlon 7850 Dual-Core 2.8GHZ.|||Usually what fixes all this kind of stuff bro, is updating all the ******* drivers you can find lol. Had some issues when latest wow patch came, especially the water effect, and i got an ati mobility radeon HD 2600, updated drivers = fix, Btw its Eldrich lol|||I dont see any need for upgrade the vid card is good and should be capable of running anything you throw at it