The Michigan market is in chaos, generally. However, I'm sure there must be pockets where housing is not in a declining market. I suggest two things.
1) Have a prospective lender do a breakeven analysis to let you see how long it will take you to to catch up with the fees it will cost you to refi.
2) Get a reputable Realtor to do a market analysis to let you know the true market conditions in your area. This should help you make a better, more educated decision. Hope this helps some!