Road trip to at least Schweitzer and Big Sky. If there's time, hit Red and maybe another Canadian area on the same trip.
If I visit the folks over the holidays, I'll take the car and that means a Kirkwood, Squaw and/or Alpine Meadows drive-by.
Will try for Crystal a couple times or more. Been there twice already, but had horrible days- have yet to really ski it. Still haven't been to Alpental.