If you're in your 20's, Stratton has an "under 30" pass that's currently $299. Okemo offers the same pass, but it's $620 to buy right now. I think Mt. Snow's comparable pass is for 18-26-year-olds, and might be $319?
Out of those three, which are the best in southern VT, Mt. Snow is the best for park. One of the best in the entire East Coast as well. Don't know how Okemo has been recently, but Stratton really stepped up their park game this year and this was one of their best park years in a long, long time.