Hey Pianowolfi,
If you have some dough to spend on that $hit I'd seriously consider a new Macbook--dual CPU, can run both Mac and Windows, just plain sexy, with battery which would not run off its life on overseas Paris--New York flight. Even if you don't need that, just consider Mac's internet security.
I'd wait until Vista becomes more popular and has all the old programs compatability drivers settled up--you know, I 'am an old school and still consider XP an overkill.
If it was me and I did not have to run latest ProTools, I'd still run Win98Se with some security updates

.
You know, I hate all those additional features I have no interest in, taking all CPU and memory power.

Best, M