telluride, it's pricey but so worth it. some of the best/steepest terrain and it's never crowded. there were zero lift lines both times i went, and from what i know the parks are pretty good too. gus's hometown, after all.
Stay away from telluride, I want it for myself lol... But seriously it's pretty sick there. It is just sucky how expensive it is. Otherwise this may help. Personally I think you'd like breck, wolf creek, or snowmass. http://www.powderhounds.com/USA/Ski-Colorado/Best-Ski-Resorts.aspx