i also have an 8800gts and am due for an update. i was thinking a 5770, but a 6850 is a significant amount better for a few more dollars, so i plan to be going with that. And list the rest of your system specs, PSU, RAM, motherboard and CPU. If your CPU is too slow you may not see much improvemnent from a gpu update, there may be better ways to get more performance from your system.