If you're interested in coming to Utah:
-Deer Valley: A lot of runs that perfectly groomed, no snowboarders, very friendly staff, and lots of fun activities around the resort. The passes themselves are the most expensive in Utah, however.
-Park City Mountain Resort or The Canyons: Less expensive than DV, while still having access to a lot of other fun activities.
-Brighton: The most affordable option. Will have to go down into SLC for activities. Very family friendly and lots of kids.
-Solitude: Just up from Brighton, not as many kids, a solid option. You will still have to go down into SLC for some activities, but their onsite lodging is more of an option than Brighton.
-Alta: Skiers only! Smaller resort. Will have to go down into SLC for other activities.
-Snowbird: More expensive, excellent snow, next to Alta. Onsite lodgings with pool/hot tub, etc. Will have to go into SLC for some activities.
-Snowbasin: Very family friendly. No onsite lodging but the staff works well with children. Becoming increasingly crowded and grooming is not as good as it used to be. Great ski school. Will have to go into Ogden for other activities.
-Powder Mountain: Closer to Snowbasin but more expensive and better grooming. Will need to go into Ogden for other activities.
I would say anything in Deer Valley and Park City if you do not have a vehicle. A lot more to do in general. Cannot recommend enough, to avoid the holiday rush, and Sundance...if it happens this year.