ok, i'm working on a cnc router table. i've got all of the table things planned out except for how i'm going to drive the steppers. i don't know where to start. Should I buy stepper controllers or build the board. where can I buy the controllers? like i'm a bit burnt out from designing and just want a simple quick buy. also, how do you program the router where 0,0,0 is? One more thing, is there interfaces for sensors and spindle control?