Why bother storing it?

I also live in Michigan and plan on driving mine 2-3 times a month during the winter. There are still plenty of sunny winter days with no snow/salt on the road, so a quick 1/2 to 1 hour run will keep all the fluids circulating and eliminate the need for battery chargers, mothballs, etc... All it needs is a good coat of wax in the fall, RainX and weather-stripping treatment.

I think it's probably better for the car also.

p.s. Don't forget the heated leather seats.