AMD Sempron 140 with the 2nd core unlocked.
2 solid state drives (1x Kingston 16 gB, 1x OCZ 60 gB)
4x case fans (3 230mm, 1x 140mm)
1000 watt PSU (Cooler Master Silent Pro, got such a massive one in case it ever expanded into dual 6990s)
4x GB RAM (4x 1 gig).