Just spent 2 weeks in Vail Colorado, absolutely awesome skiing and a really good resort, with Lionshead down the road equally as nice as vail, Beaver Creek about 20 mins drive also excellent resort snow wasnt as good whilst I was there as it's lower in altitude than the two mentioned above.
Highly recommend this place been to most of Europe as been skiing since I could walk
and this tops the lot for amount of skiing, variety of different runs, and the vast amount of tree skiing is just unreal, if anyone gets the opportunity to go, do so!! Only possible downside is that its a long flight away but flying doesn't bother me