British Columbia cat trip for 5 days in the vicinity of Nelson.
+1, if I had the cash this is what I would do for a B/C trip. Guides, cooks, people to wipe your ass. All you have to do is wake up and board.
Island Lake is pretty famous near Fernie, but I think they're booked up to 2099 or so. Anything in the Nelson to Fernie part of BC seems to be where the most things are filmed, famous photos taken, etc.
Look at snow cat operators. They will get you out there at a reasonable price and handle the safety precautions and such. Not to say stuff can't go bad on you, but they do a pretty good job keeping you out of trouble. It is wild snow though, so you'll want to listen to the guides.
Seems to me this is more of the type of trip you are looking for.
I would take snowolfs advice and do a guided avi course. March can be awesome in the pnw. Go to mount baker and hire aai guide liz daley. Could do you well to tour around and see another female ripper. Dont know how to linky info.
Fwiw.. I am only a half dozen years from michigan, and started riding at pine knob and alpine.
Silverton is not really having a great snow year. It is alright for what it is. Lots of billy goat hiking you have to do at that area. I'd go with the Liz Daley tour idea if you are going to put that amount of work in. I don't think this is what the OP wants, though I could be wrong.