I'm planning on using your 425 oz motors and need help on selecting the right interface and driver boards. The PoKeys57 CNC USB card looks good but I wonder if the 2.5 amp driver boards shown with it

You can use the Pokeys57CNC board with our 3.0 amp drivers. The Pokeys57CNC has all of the headers necessary to provide the pulse train to any common stepper driver. Here is the link to the Pokeys57CNC interface board: https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach4-mach3-USB-ethernet-Board Here is the link to the 3.0 amp stepper motor driver: https://www.buildyourcnc.com/item/electronicsAndMotors-stepper-driver-3!0a