Huron Scuba in Ann Arbor, MI has a good reputation. It's about 40 minutes or so west of Detroit. I did my rescue diver class with them. I am pleased with the owner's professionalism.
Huron Scuba, Ann Arbor Michigan: Scuba classes, Dive Travel, Equipment, & Mixed Gas Fills
PM me if you would like any specific info about instructors and whatnot.