Well I have Vista Business 64-bit (free from university

) and it works lovely. Core2Duo 2ghz, 2gb RAM, GeForce 8600GT. So not top of the range, but not slow either, and I can't say I've found Vista to be slow. I remember running a benchmark on here under both 32-bit and 64-bit Vista, and the 64-bit one was faster.
Don't care about all the digital rights crap... MP3 audio doesn't have DRM, and if I
bought a DVD, I'd have the DVD anyway. And I think Slysoft AnyDVD works in Vista anyway, to remove all the protections, and allow skipping the annoying "Don't copy this DVD" crap. Doesn't all that stuff go against Fair Use anyway? Creating a back up of the disc...
The only game I actually know about with a 64-bit version is UT2004, and I think that was made by AMD, but don't quote me on that!
Vista is fine for a gaming machine, and don't let anyone tell you otherwise. Been happily using it for quite a few months now, when I built this computer. It's just a shame my laptop (with a GeForce4 Go 440) isn't good enough to run it!