Yea, I'm on the fence between making my own driver and using a real stepper driver, but I'm ordering components off Digikey and they don't seem to have any cheap stepper motor drivers. I was also a bit concerned about the fact that those MOSFETs were only rated for 12v Vgs, so I think I'll look for some other ones. And I guess I won't be using external diodes. That's also a good idea about using the MOSFET as the flyback diode, maybe I'll try that. Thanks for all the info.