How about a nice DSP based driver that is like the new MEADE telescopes. Turn it on and it self calibrates and keeps itself happy. If you give it something it can't handle it just parks itself at a safe location you pick like down into a beamstop in the case. YEA YEA DSP this DSP that. Don't bother. I think they have come the distance and could really useful at their present level of power. I also think that it could be more efficient and keep power down. You might even be able to run them like we do fighter jets in the unstable regions for more speed and better handling if the settling times could be better managed by using a few million positioning points per second. Think of it like calculus. It's in the limit around the point. In this way you are not worried about establishing a feedback PID thing and are free to run about the range without ringing. You can even precalculate the over shoot so it gets just in time positioning. Pulled this out of my...... so take it for what it is worth. Not much just an idea. If you remove all analog adjustments you can shrink the required board size as well! Come on 1"x1" drivers that fit on the back of the heatsink for the scanners. I still want to see 200mw white light in a 1 lbs cube no bigger than 6"x6"x6".
One last thing. Someone make a power supply that is designed for the scanner set that is plug and play. This is not hard but having two supplies is a pain in the ass. Run at 28-48v for more coil moving.