We stayed at the Four Seasons a few years ago -- it isn't ski in/ski out, but they have a ski concierge at the base of Blackcomb, which is a very short walk from the hotel. (a minute or two) You can store your skis and boots there. Then they have a valet at Whistler base, so if you end up there you give them your skis and they take them back. Free transport between areas, as well.
Anyway, you asked for the nicest, not sure you can beat the Four Seasons. But I don't know what else is there, either.
Oh, they also serve poutine topped with foie gras, sheer decadence.