Have you already purchased these motors, or have you just selected them. The high current requirements of these motors are going to force you to buy a more expensive driver board than would otherwise be required. The primary characteristic of a motor which determines the driver needed is the current requirement. Many of the lower cost (although quite capable) drivers can deliver a max of 2.5A. You have to step up to a 5.0A more expensive driver for the motors you have selected. There are motors with 150-300 oz-in that run at around 2.5A
If indeed you already have these motors, then I would suggest you look at the Geckodrive G201 board. It can drive up to 7Amps, and a bit over $100US per axis. As far as the power supply, I depends on how many of the motors will operate as the same time. If all three motors can run at once I would recommend a supply capable of delivering about 6-8A, with an output voltage of 60-70 volts if you need to run at high speed. To keep costs down you could go with a 36 volts supply, but it will not be able to drive the motors at as high a speed as the higher voltage supply could.
www.kelinginc.net has a kl-7212 power supply for about $150US which can put out 12A at 72 volts. That, along with the Gecko drives will provide MAXIMUM performance from your motors.