I did mine with 850 oz-in peak servos, 500 line encoders and G320s from www.homeshopcnc.com. I currently have 2.5:1 belt reducers and 1" 4-pitch ballscrews. It is pretty much unstoppable, and *too* fast - It'll do 400 IPM at 70V, but I only run it at 200 IPM.
Regards,
Ray L.