hi,
my advice would be to use an outdoor carcoon. they plug in, come with a trickle charger, and keep the car bone dry and dust free.i have one to store my elan on the driveway. they take a little longer than a cover to 'get out of' but are SO much better. the only disadvantage with them is that they will collapse/deflate even under minor snowfall. but if you can put it under a carport....no problem.
try to avoid covers, they will scratch the paint and trap condensation no matter how good they are. a fact I discovered to my own cost.
hope this is of use!