I have a Abit IC7-G motherboard (AGP 8x slot) and am currently running an ATI Radeon 9800 Pro 128 MB, Intel P4 3.2 Ghz socket 478. I don't want to upgrade my motherboard and CPU yet just to have PCI Express. I would like to go the Nvidia route for various reasons, but it seems my choices are more limited. Is a 6600 or 6600GT really much better than a 9800 Pro? If not, what is that I could use?