2K Professional. Its built on the rock solid NT architecture.
Yeah, so is XP. Not only that, XP (professional) offers dual CPU support, and pretty much everything Win2k SERVER offers. It's a no brainer IMO. Turn off all the in your face stuff...and you're set. Not to mention the better hardware support, build in CDRW support, etc. Just a more robust OS. I can't say win2k has ever crashed on me, but I have had MANY software issues.