I would avoid the I-70 resorts during peak season. Crested Butte will not be as busy... they seem to have a decent start snowwise and if you don't care about the more extreme skiing on the T-Bars, coverage should be pretty good. If you do like steeps, the T-Bars may not be running yet. One never knows. They could get dumped on. CB is my favorite CO resort, easily. If you really want to go to the I-70 resorts, I would maybe hit up Copper Mountain. Great mountain, well laid out. Village is meh but if you're jsut going skiing for a few days it might be better. Other option is Purgatory because Durango is cool. Lift pass should not be as expensive as Vail or Breck (will be packed). Keystone will also be jam packed full of families.
Honestly, chase the snow... NM is highest risk, Wolf Creek lowest risk but small but I've never skied it and if you like exploring the mountain, you can probably have a good time. Again, can't speak from experience but, dude, they have 10 lift spinning right now.