It seems this topic has been rising to the top of people's minds for some time, so now to open up a can of worms.
Some background (sorry if you already know this):
As we all know, stepper motors come in a variety of shapes and sizes. They also have varying number of steps, ranging from about 24 to 400 steps. As the number of steps increases so does the cost.
At present the RepRap uses 400 step motors, which have a 0.9