Soldier Mountain bc of the cat skiing...he couldn't say enough good stuff about it and was going back again for like the third year in a row. Of course I checked it out and the reported snowfall
A bit of an oxymoron as you need elite snowfall (400+ inches) for cat skiing to be viable on an ongoing basis. But of course if you live in Boise and watch the weather reports, I'm sure you can score the good days. But this is not a viable plan for an out of state visitor on a fixed schedule.
There is a close intersection of this list with the uncrowded list I posted in the other thread. Sunlight has already been mentioned. In the Okanagan, Apex does not have the tourist bed base that Big White and Silver Star do, yet terrain is as good (some experts would say better) and it's about the same distance south of Kelowna that Silver Star is north. Castle Mt. is repeatedly mentioned by several of us here yet is still under the radar to most of the North American skiing public.
The interior Northwest and Montana are full of the type of places Jnelly is looking for. Head east from Spokane on I-90 and you will hit first Silver Mt., then Lookout. Keep going on to Missoula, where Montana Snowbowl is the 2,600 vertical local hill. Continue another 90 minutes SE to Philipsburg a tiny but charming and authentic town with Discovery a 15 mile drive up the road form there. Lost Trail is a 2 hour detour south from Missoula or SW from Philipsburg. There are more, but these could all be hit in a 5-7 day road trip from Spokane or Missoula.
+1 to that. As a local I've had several impressive powder days there but you need even more luck with your trip to L.A. than to Boise and Soldier Mt. I have documented the erratic and recently grim history of SoCal snow conditions:
http://bestsnow.net/scalhist.htm Mt, Baldy is 90+% natural snow dependent and the last good season here was 2009-10.