Window XP or XP PRO

Unless there's something in XP Pro that you know you must have, XP Home is good enough.Direct3D performance used to be a bit lower in Win2k and XP than Win98/ME. I think that has changed now, since XP has become so popular, hardware manufacturers have probably optimized their drivers more for XP/2k than 9x/ME over the last year and software is also being written with XP/2k in mind. If you have a ~700 MHz or faster system with 256MB or more of RAM, XP is the way to go.