The four boxes for my minions are all identical Dell Inspiron slim-towers. 2gHz Core duo, 1GB RAM, 250GB HDD, Integrated graphics/network/sound. The total cost for all four was $1300 (free shipping), a few months ago. Even with the cheap Intel integrated graphics, I get 20+ FPS in the middle of Shatt, 35+ in most instances and combat, and 60+ while questing. They don't use up much power (250W power supplies, and I know they aren't even coming close to that), and don't take up much space, which is ideal for me.