I call it a "Guts Upgrade" because .. well, I'm changing out the all important stuff. What prompted me to do this is partially Vista, which I don't plan on buying still for some time because many things aren't supported and it seems buggy from what I've heard.
Anyways this is what I have now (also in sig):
DFI Lanparty Nforce4 Ultra-D
Socket 939 Opteron 165
G Skillz DDR500 2x1GB
eVGA 7900GT CO
Antec Truepower 2.0 550W
Now I'm thinking that I definitely want to upgrade to a DX10 card, probably an eVGA 8 series, not sure which one. For CPU, definitely Core 2 Conroe, probably E6320. Motherboard, I have no clue on. Memory I could use some suggestions. Lastly, I don't want to upgrade my PSU as I don't think it's necessary, I only consume 400-450W at the most now, and I've heard that this stuff is only more effcient.