Having owned a microscope as a kid, the most important part isn't the optics; it's the lighting for the stage. Microscope optics, while not unimportant, mean nothing if you can't provide enough photons of the correct "color temperature" and polarization, at the proper angles (including backlit).
For engendering love of science and visualization of the microscopic world, a simple handheld, portable digital wand that interfaces with a pad or phone is probably sufficient