what isn't the difference? lol
Yeah Win2000 is Windows NT 5.0, and Windows NT is a good OS. Win9x (95s, 98s and ME) is not.
Currently Win9x has slight better compatibility, but with new drivers from 3dfx and nVidia for Win2000 the speed of both is about the same. Win2000 kicks arse. Much more stable, better memory management, more effecient multitasking...you name it, WinNT does it better than Win9x.
If you don't like the price on Win2000 wait for whistler.
Whistler personal is a slight Win2000 Pro upgrade, modified for use on a single processor home system. With a few additions to emulate DOS I believe (for really old stuff).
Windows NT is the way of the future though, Win9x is dying off fast.