Fazz, Vista is something that is best avoided at the moment. Like FJ says, it doesn't offer any compelling advantages while bringing in a whole truckload of disadvantages.
Everything just runs better in XP, especially games. The video drivers still don't work as well as XP's, and memory usage is still through the roof (by comparison, idling in Vista always uses 40% or more of my RAM, while idling in my primary OS using fluxbox uses 5%. I think XP uses 25-30%).
The only reason I have Vista is because I..um...got it for a bargain price *cough**cough*.