I'm wanting to do a small four axis minimill.

Four axis will probably be the Sherline rotary, since I understand it's more or less "bolt on and play" ready.

Looked at your "BF20" motor kit, and I'm wondering if the combination will handle another Nema23 motor? I'm also thinking I'm probably going to want to use mach3 with a motion control board - will the smoothstepper work?

I'm not hung up on fast rapids, but I do want a fairly precise system - slow is okay, as long as it's not losing steps...