I would (and did) go for XP. That's why I bought a Dell machine - they are one of the few "big name" manufacturers still supplying XP as an option.
I must respectfully disagree with Jon that "Vista is not ready for prime time". The problem isn't Vista; it's old software which "breaks the rules" that Windows programmers have always been urged to follow. Versions of the astronomy software I wrote 10 years ago for Windows 95 work perfectly on Vista because I was rigorous in following the rules. BD breaks them "big time" and hence struggles to run under Vista. That really is not Vista's fault, but the fault of the BD developer.
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