I went ahead and ordered the HobbyCNC Pro Chopper board today:
I should be receiving my 100oz steppers and the driver board about the same time.
I found a really nice pdf download on Gecko's web site that talks about steppers and the various configurations, torque vs. speed, and power supply design and requirements. Quite a good read:
Stepper Motor Basics Guide.
Plus there are a lot of other interesting white sheets on there as well:
Application Notes and Manuals