I'll second gerry's statement. the stepperworld board is a bit more difficult to set up properly in that you will need power resistors to limit the power to your motors based on their specifications. The other two have adjustable "pots" to set the motor current. I started with a stepperword, and it works but you'll be much happier with one of the other boards. And, if you have a few extra bucks, get a breakout board from bob cambell for a really nice setup.
-marc |