I would definitely add Mark Schauer in Michigans 7th congressional district. It had gone Republican from 1992 until 2008 when Schauer won but I am certain it will turn Republican again.
Juan-input on the best challenger?
MI 7-Mark Schauer’s challengers:
Marvin Carlson, http://www.marvincarlson.com/
Joe Schwartz
Greg Merle, http://www.gregmerleforcongress.com/
Brian Rooney, http://runwithrooney.com/
Mike Stahly, http://www.stahlyforcongress.com/
Tim Walberg, http://www.walbergforcongress.com/Home.aspx