PLEASE DON"T MIX DIFFERENT MANUFACTURES

ATI and Nvidia don't work together, just get yoursef another 8000 series card, I don't even think 7000 will work good with your new and shiny 8800gt, btw if you consider getting another 8800gt and set them in SLI, then know this: SLI support ONLY one screen, unless you get yourself TripleHead2Go to split one big screen 3840 x 1024 @60hz (triple 1280) works only with analog btw.

hope that helps, good luck 8)