The first design consideration of this device, is that I don't intend entering the RA and DEC for thousands of sky objects into a ROM.  The memory will store the owner's own sky objects, as he or she encounters them. Once stored, the "Go To" function will be able to direct the telescope to the desired coordinates.
As mentioned, I will design my guidance system around a heavy equatorial mount already equipped with DC stepping motors that are already aligned to the proper axis.  They will have the right amount of power to move the desired telescope, and will be rugged enough for out of doors use in both summer and winter.
All I need to know about them are their power requirements, their operating voltages and currents, and their stepping characteristics. The size, shape, and spacing of their required stepping pulses are most vital. I have already decided on a proportional control scheme that will determine the distance of the move in advance, so that I can speed the telescope to its new position in such a way that it slows down the right amount before the end of its travel, preventing the telescope's momentum from causing the system to overshoot its mark.