Bill Gates' computer that he had built at christmas:
2 4800+ X2 (that alone is amazing, two dual cores)
32Gb DDR 600
1 Terabyte of Hitachi Ultrastars, 15,000 rpm 16MB cache
4 7800GTX
Liquid Nitrogen Cooling
Refrigerator Attachment
60" Plasma HDTV
Integrated XBOX360
Ok, so maybe that's not his real computer, but that's what I would get. Gates drives an accord because he's really environmentally concerned, he gives Billions of dollars yearly to many charities, he's not aselfish guy at all. But here's one cool thing, his house contains 2 miles of fiber optics in the floors, there are sensors in each room that detect your thermal signature then load your preferences as in lighting music tv food and temperature, and then the fiber optics in the floor change and follow you around, Gates' is a green-lightening-smokey-glow that flows around the bottom of his feet wherever he walks. That's cool.