Greets! Have recently learned about a new stepper driver from TI - the DRV8711:
They are also listing a new PowerFET:
...which is a great companion for the driver.
Creating a BOB with the DRV8711 AND the CSD88537ND installed would be a really powerful product.
Going further, you could include either an ATmega32u4 ("Leo") or ATmega328 ("Uno"). Seems like that could be a fairly useful combo for stepper projects...