Take a look at http://www.ntep.org/
for varieties tested in your area as well as which specific brands were best.
As Grassman said, Fescue / Bluegass blends work well.
If Michigan is about the same as southern Ontario temperature wise. It's normally the second or third week of April before the ground temperature gets up to 65F Degrees. Sometimes it's been as late as mid May here. Just depends on the weather and when the frost comes out. I imagine it will be early this year with the winter we're having. My rule of thumb is always be ready to go April 1st