Hi so many to choose from. I have some vexta steppers they are the same size as PV269 4 wire bipolor 440 oz/in but mine have a custom winding 4.4a 2.5v I have been looking at lots of drives but i am not sure what amp. rating i need? If i use a microstepping drive do the motors need the full 4.4a I have a 38v 10a unregulated power supply. Many of the cheaper drives are only 3a. Any info you can give my will be helpfull i am a nubie! Here are pics. of my steppers thanks.