Right now I have a ATI 9600Pro 64MB and just upgraded my monitor to a Samsung 2343 @2048 X 1152 and was wondering what would be the best upgrade for my system. Its a PowerMac G5 DP 2GHz, thanks
The Radeon X800 XT Mac Edition would probably be your best bet. There was also an X850 XT that Apple shipped. I've also seen GeForce 7800 GTs on eBay that people have flashed to make it work on a Mac.
I beleive that one can flash (... or buy) a 7800GS. Apple didn't sell them, everything involving the 7800GS AGP is aftermarket. Unfortunately, if there was a 7800GT that was AGP, I don't know if anybody got it to work.