Win XP pro is the way to go. Everyone that prefers 2k was very sceptical to begin with and went with 2k as soon as they had the first little problem with XP they could dig up, I'm sure.
Like those who say they will never install SP1 because it messes everything up. They just want to be excentric about it.
XP can be set to look just like 2k if you don't like the new style, including search if you hate the puppy.