I have been using Win2k as my only OS for the last 10 months, one of the added benefits of running games under Win2k is that there are very few game crashes, they just run and run without any problems and if they do have a problem, you don't need to reboot the box to relaunch the game, just relaunch it, win2k manages it very well. One of the main problems that I had was that win2k would not let you have the same refresh rate that your monitor supports in 2d mode, V-control solved that problem very nicely.
Jim