If you are running on an LCD, be aware of the texture shimmering on the 7800GTx's. And, owning both a 7800GT SLi system and a X1800XT system running on Dell 2005's, the ATi has better IQ....while not nessasarily the case in all things, enough on most titles to see the difference. And the speed differences are, for the most part, not even noticable. And....the X1800XX hse room to improve driverwise (the 7800xxx is pretty much derivitive of the 6xxx series, the X1xxxx series is totally new) and has features the 78xxxx doesn't. If you have the idea of going SLi and run on a CRT(and are willing to deal with the SLi problems), get the GT. If you are on a LCD, get X1800XL. plain and simple.