+1 on matthewbridges comments
I have and love the 2S. I agree that the 2A is easier
to adjust, but once adjusted most people just leave it. A bigger mill will be faster, but the 2S is plenty fast and pretty much the least expensive, high quality roller mill around. Realistically, it's all the mill you need. It may not be all the mill you want
, but I'll let others chime in for that.