Surely all you Canucks up in the great white north know that skinny snow tires work WAY better than wide tires on snow and ice. I'm just an old ski bum from California but we learned that lesson back in the 70s. Find a set of 17s and go 205 Front and 225 rear. The money you save in tire expense will probably pay for a decent set of 17 takeoff rims. If you fill, sand and paint your old 18 rims you can sell them tomorrow for $400 cause they will look like new.