More than likely windows 7 will be a bug-ridden p.o.s. for awhile after it comes out anyway, just like every other windows o.s. I'm still using XP pro and I'm not going to switch/upgrade until I absolutely have to.
I've been using the Windows 7 RC for a month or so now, and haven't had so much as a hiccup. I think they might have actually turned themselves around after Vista.
Do your research. I hear some of the more recent dell studio xps editions are having trouble with vent placement. The insides pretty much turn into a baked potatoes because when the screen is open it blocks the vents.