Re: what should i upgrade?
It will be faster if you upgrade to a 7800GTX. Memory transfer rate is a lot faster and higher pixels per clock which is nice. But if it were just an upgrade to a 7800GT, I don't know if it's worth the money. Do you plan on playing games at higher screen resolutions? If so, the upgrade will help.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?