my uncle who is a programmer showed me his computer, I cried almost. he spent 3.5K on it!
Specs Are:
Dual Xeon Processors 3Gigs a piece
X800 XT Platinum Edition
3 Gigs of RAM
6 HDDS = 1 TB of space
I was there as he was explaining to me about building mine, He gave me XP Pro for free! XP Pro is more for busniess and work like, word, xcel, powerpoint etc. If you plan to do a lot of work like HW or actual work on it I suggest getting Pro if you just want a OS that is stable and can do many different things, not mainly used for work then go with the Home edition