I use w2k pro as well, and find it perfect as Diodorus Siculus does. I find xp (on my new laptop) too intrusive.
There is nothing really important which xp pro can do but w2k pro can't. So for existing users of w2k pro, I would say there's no particular need to upgrade.
But since you're buying a new OS, much as I personally prefer w2k, I would suggest you get XP.
XP is a very good OS (mainly because it uses w2k's very stable platform), and since it's a more recent OS, it's the one to buy.
You will get longer support. There are bound to be things which MS will only give to xp but not w2k. This is already happening, especially with XP's SP2. SP2's features are a mixed bundle, some are good, some are silly, but in the long run, XP is still a better bet.
Then it's a question of which edition of XP. XP Pro has extra security and networking (such as use in a domain) features, which a home user doesn't really need. XP pro, like w2k pro, does give you more options in controlling how the computer behaves, but generally XP Home would be fine.
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