Hm, actually...you said you tried the beta, correct? How is Windows 7 anyway? I'm kind of thinking about it, if it gets rid of/fixes what made Vista annoying. Mostly because there is an app or two I have that would benefit from DirectX10 (such as PCSX2).
I'm fulltime running Windows 7 on all my computers. The main ones at least. I'm left with a low-low end emachine celeron to use until I can get my laptop replaced. it CLAIMS to be vista ready..... oh no, don't even try. it even came with stock 512MB ram.... I upgraded it to 2GB and the cpu still lagged too much for comfort in vista. Windows 7 is definitely faster, and far more compatible with my system. The ui is more consistent, Explorer shortcuts are useful, I think Microsoft got it right this time around.