It depends on what you're going to do with it. I think some of the Home
versions don't support IIS, but I couldn't swear to it. I have an opinion
that I would buy at least the Business version, and I think it's because of
something I read about the IIS stuff, but I don't remember it clearly. I'd
actually just splurge and get Ultimate.
Here's a web page that compares the different versions of Vista:
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