LegendCJS,
The ProboStepVX driver is unipolar so the torque output of the stepper motors will be quite a bit less than the published bipolar ratings.
This wont be a big concern however since the Minitech has 10 tpi screws so you will have plenty of torque with the 23-305-DS8A motors, 305 ounce unipolar rating with be more than enough for all axis.
The larger RS23-570 motors will be complete overkill and the higher rpm limits may suffer if you decide to use them.
If you are looking for a very inexpensive 3 axis unipolar driver why not solder together a HobbyCNC ez driver, its only $64.00 and it has a built in breakout board.
The HobbyCNC kit uses the same driver IC chips as the Probotix unipolar drivers by the way.
http://www.hobbycnc.com/products/hob...ver-board-kit/
These micro switches work well>
http://tinyurl.com/kkxwqx
Jeff...
P.S. Fixittt is a Minitech expert, his experience and help will be invaluable.