The smooth stepper is coming along nicely, all of the problems have been sorted and now there are just a few additions to be added to the function of it. However the SmoothStepper doesnt replace the breakout board, what it does is replace the software pulse engine and the parallel port. You still need a breakout board, well you could do without one as in the parallel port set up but .......
I have both PMDX 122 and Acustep breakout boards on two of my machines. If its just a standard breakout you are looking for then I recommend the PMDX 122, they are quality made boards. I must say I havent tried many others so take of my opinion what you will.
Hood