Vista is not as computer intensive as it says it is. I have the Ultimate edition on my system, and while it is a more power machine, it's not like the OS uses very much. I'd say it's only slightly heavier than XP, and you can disable a lot of the effects that use your system resources. However, since Vista will be very error prone and have little compatibility, I'd wait at least 6 months before fully switching over. I would install both copies of windows, and test out vista fully before you decide to switch, and even then I'd keep a copy of XP installed somewhere just in case.
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