Easy flight from New York/Newark, preferably non-stop.
Reliable, good conditions.
Preferably walk or shuttle to lifts. Lodging with a kitchen would be preferable to cut down on food costs.
Fun variety of terrain for me.
Excellent ski school for my cautious 11-year-old daughter and wife. Last year at Winter Park was the first year in many that I could convince my tropic-born wife to try skiing, and she actually sort of enjoyed it for the first time ever. She's a tough one.
Beautiful scenery and other activities nearby (with a real town).
Obvious thoughts are:
Summit County, CO
Others recommended in the forums, but are probably harder to get to are Jackson, Whistler, Aspen, Steamboat, Whitefish.
Some good ideas at this thread, but looking for specifics on crowds that week too: