for deep powder your best bet is Utah, I would guess your second best bet is southern colorado (wolfcreek), then northern colorado (Summit county, ect). There many other choices for deep pow, WY, Tahoe (if and only if you are there after a big dump, and the snow is not as light as the rockies one).
Utah is said to have the best snow in the world and some of the best pow staches to be found.
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