I've been running Vista for a while now and really like it. Although, I did build a new PC for it, so it has plenty of power and allows me to run with all the fancy bells and whistles turned on, so that helps. Check out the Windows Vista Upgrade Advisor before you begin. It will tell you what sort of experience you can expect, plus will let you know if any components of your PC aren't compatible.

Visa Upgrade Advisor


M60's
VP150
QS8's
HSU STF-2
Onkyo TX-SR805
Audiobytes for the PC