Replying to Big Sky, Jackson Hole, Snowbird, ect....

So me and my friends are looking to make a trip out west for our senior year and are looking where to go. Those three are the ones we kinda narrowed it down to. We want to stay inside the US so now Whistler but if you have any other suggestions, that'd be great to hear. We are looking for the best skiing experience we can get inside the US. Powder, above treeline skiing, park wouldn't hurt but isn't essential, and we don't care if there's a town nearby or not. We'd be going hopefully in March because of when we have off of school. SPARK NOTES: skiing trip out west, explain where you think we should go to find best skiing inside US.