I'll second Bob's picks. I go there 30-40 days a year now. It is an awesome (but sadly crowded) place. DEFINITELY do the snowmobiling, I highly recommend!! Stay in Dillion or Silverthorne, places are cheaper than Breck. You can get around in a car, but traffic in ski season isn't fun. They have free buses that run 6am-11pm county wide. Most run on a 15 or 30 minute schedule if you don't wish to drive. The pass over 6 is as he describes, beautiful. Copper can be a pain to get to, they are right off 70 and I have seen both off lanes backed up onto 70 with people trying to get in during the AM. Keystone and Breck have a nice mix of runs, if you are a good skier Abasin can provide some fun and challenging runs.