Telluride, Colorado by far one of the best places I have skiied.  I've been all over Utah and all over Colorado, haven't really tried Jackson Hole or Whistler yet but best place so far is Telluride.  I think it's far enough away from a lot of MAJOR cities so people have to "make trips" out there as opposed to driving up for the day but even saying that, I know when the parking lot is packed the slop is not because it is so huge.  The terrain is steep and fast which is what I like to ski.  The grades are harder I think too.  A green at Telluride would be like a blue on the Front Range, Colorado mountains.  Wide open runs and not an excessive amount of stupid SLOW SIGNS!!  Maybe it's just because I have such a good attitude about Telluride too but it seems like people who go there know how to ski/board better and know how to keep a line and not ski across the whole run doing the "pie" getting in everyone elses way. 

I have skied a lot of places espcially living in Colorado for five years. In Colorado I like Vail because I skied it so much, Winterpark because it was off the beaten path a bit and Steamboat because of it's charm and what always seemed to be good snow whenever I went. Southern Colorado is nice as well, more hype then substance however in my opinion. I really liked the Lake Tahoe resorts that I have skied as well. I have never been to Utah but I need to see Alta (No Snowboards) & Snowbird. And I have heard fab things about Whistler in Canada.

But bar none my favorite ski area in the US is Jackson Hole Wyoming. I love steep difficult terrain and Jackson Hole has it and then some. It also has had great snow everytime I have been there. If I had to pick just one place to ski it would be Jackson Hole. Simply an awsome ski area.