1 - Cheap Power XL

- AMD 64 3000+ CPU (socket 939) (~$160)
- GeForce 6600GT-based video card (~$165)
- 2x512MB RAM kit (~$90)
- Any decent motherboard (like Abit AV8) (~$110)
- Quality Antec case with 380W power supply (~$80)

Total: $605

It is a surprisingly fast PC, especially considering the price it costs to build it. It should be mainly for gaming.