Eh, I had Vista on a AThlon XP, 1Gb ram, 6800GS, etc and it ran just as fast as XP did...
nVidia drivers for Vista sucks, most people have nVidia cards, thats why people think Vista sucks.
If windows 7 is going to be on the same level as vista or better I'll get it. I'll have to skip it if anything like XP.
Personally I don't like the idea of windows releasing a new OS so soon. Vista has only been out for a year. A replacement for it shouldn't be around the next corner. I'm not a vista fanboy. I tried it out and liked what I had. Keeping in mind that I'm talking about the 64 bit version of vista with 4 gigs of ram. To prove I'm not a fanboy the 64 bit of XP had also given me 0 problems during my 2 months free trial period. I just had problems getting support for XP 64.