Hey! awesome choice with the MPCNC! never put my discov3ry on it but i put a extruder,dwalt611,and a 3w laser.
I say go with a Ramps1.4 board with drv8825 drivers for the nema's. super easy and its what the mpcnc was built with by vicious.
I've ran my discov3ry on ramp's 1.4 on my rostock, pretty straight forward and just a solid cheap reprap board.