global accessories make one of the nicest car covers that i have ever owned. they are made to custom fit your exact year car. I would recomend at least the Evolution cover which is what i own for my Elky. All the covers come with multipe year warranties.

http://www.global-accessories.com/products/index.phtml?prod_id=wolfcovers&cust_id=global&SYSTEM=cartlink&SESSIONID=&ACTION=