I have also brought 4 of thease stepper motors from eBay.

I don't yet have a finished CNC unit to use the stepper motors on, but as my unit is only going to have a 300x300mm working area I think they should be ok.

I am still messing about with the best way to drive the stepper motors.

I have been using the Tom McGuire DIY stepper driver found on the instructables.com, and a LM317HVT to limited the current to 1amp, running on a 37volt PSU.