I would say go with the new Gecko Drive G540. 4 axis driver all ready to go with built in breakout board. It uses the new g250 stepper motor drives. I just bought 6 of the 251's which are the same the 250, but with headers instead of pins. They are incredible. The G540 will handle 4 3.5A motors all in a nice little enclosure. I also think that Keling makes some stepper motors that are a good match for these drivers. -Adam
www.adambrunette.com - Converting My Harbor Freight X2 And My Jet Jvm-830 Knee Mill, As well as many other projects.