I have an Ubuntu box myself - although I use to be a huge SuSE fan, I really like this Ubuntu install to 'play around with'. I don't use it that often - but it's there.

Also.. you DO NOT want the 64-bit version of VISTA. If you read MaximumPC at all... it's a disaster and horror story waiting to happen with all the problem, incompatibilities, etc. Worse than the 32-bit version by far.