For Utah, see http://wepowder.com/forum/topic/212224
Alta/Snowbird is the best, but also the most crowded generally. Personally, now I go up to Snow Basin more now since it's less expensive and less crowded even though they don't get as much snow as Alta.
Tahoe areas are great too though and skiing Squaw Valley and Alpine Meadows (North Lake Tahoe) could keep you happy for 4 days. They will have a big base by then given the snow coming in now. Kirkwood has a lot of steeps, but it's further south by Heavenly Valley.
Anther option that is overlooked is Seattle areas. Weekends can be crowded and if it's storming sometimes the Snoqualmie and Stevens Passes can be a tough drive, but there's a surprising amount of really good skiing between Alpental (Snoqualmie) 1 hour from Seattle, Stevens Pass 1.5 hours from Seattle) and Crystal (2 hours from Seattle).