OK here's my obligatory list. 1. Ultra 1 170E Creator 3D 2. Ultra 2 2x400 Elite3D M6 3. E450 loaded 4. Ultra 80 Loaded 5. E3500 6. E10K 7. Starcat 15K 8. SC2000 9. The really big Fujitsu machines 10. SunBlade 2000 loaded Honorable mention: SS20 with the right balance of speed/cpu's/heat dissipation