ATI AIW X800 XT. Debating if I should just switch it with the X850 XT. Not much of an upgrade, but I hardly use the AIW features.
Want to go with a PCI-E, but that would mean I want a dual core also. And those are expensive besides the Opterons. But then people buy Opterons to OC it and that would mean better ram. So upgrading right now isn't worth it for me. I'll wait for prices to drop.