The type of scope you get really depends on what you need it for. If you just want to test viability, a simple monocular brightfield scope that can go magnify 20x or so will do. But if you need to spend alot of time at the scope counting get a stereoscope. If you are doing morphology, a stereoscope with phase contrast or DICT would be best. Do you want to take pictures? Get one with a video camera. It really depends on what you want to do.