OK, next question? We need stepper motors and driver boards.
I believe Bob used a xylotex stetem. They sell the board, 24V power supply and 3 269 in-oz steppers for $380. This is a bipolar driver board, and I understand that bipolar is prefered to unipolar (but I can be corrected). 1/1, 1/2, 1/4, 1/8 microstepping. 2.5 amps at 35 volts. (why not 36 volts like the power supplies you can get?)
Then, of course, is the popular Gecko 4 axis controller which goes for about $250 without the steppers. vast microstepping options. 3.5 amps to 50 volts.
There is also the HobbyCNC board which you have to solder yourself. Cheap at $67, $260 with 200 in-oz steppers. Unipolar only. 1/1, 1/2, 1/4, 1/8, and 1/16 Microstepping. 3.0 amp 36 Volts Maximum.
Lastly and cheapest are the various Chinese Toshiba chip items that are quite attractively priced, even with overseas shipping. Some as cheap as $200 or so. Similar microstepping and maximum current as the above units.
So, which way to go? I might be cheap, but I hate paying twice and don't like getting shafted by overseas people who just won't deal with you if there is a problem.