My winter prep is a good solid wash, clay, paint sealant day. I wouldn't really worry about polishing anything since the salt is gonna tear it up anyway. Then every couple washes or so, throw a coat of H2OGG on. Also, don't forget the glass sealant and hit it with the glass boost when you do the H2OGG. Then when spring rolls around, clay all the crap off from winter and go ahead with the waxes and all that.
P.S. If I know its gonna snow the next day, I usually spray the inner fenders and spots where I know snow will want to build up with the Undercarriage Spray. It helps keep it from sticking.