Windows 2000, I don't really consider Windows 95, 98, or ME viable choices. Windows XP is ....okay I suppose, but after a few experiences with it, I don't want it to touch *my* computer. Personally, I would much prefer to go back to Amiga OS, and say good buy to BSOD's! but I don't think that's going to happen
I may switch to Longhorn in the future, but it depends on a *LOT* of things! Chance are I'll wait until I have my second system set up and I'll try it out on that before attempting to use it on my main system.