What version of XP, home or pro? Also, what are you planning to do with the PC? If your gamming, I'd go with a XP version (as much as I hate it). If you don't have any major plans, go for W2K Server, because it costs more and has other bennies like software RAID and IIS (not that I'd use IIS for anything but intranet, again - my opinion).
Jarrett
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