Do you have the flexibility to decide a week or two before your travel dates? If not, here are my thoughts.
Brighton does not have many closeby lodging choices, but at that time of the season you should be able to get something because there is not much competition. See this page for motel type places: http://www.brightonresort.com/stay/lodging/ You could also look at a private house rental. Just playing the odds, Brighton is one of the best bets in the lower 48 for decent conditions in early Dec. Although it is not huge, if Brighton were mostly open for your visit I could see enjoying 5 straight days there. Solitude is one mile away and you could go there one day off your ticket just for variety.
Winter Park and Copper are pretty close together (~75 mins) and if you had a rental car you could split your trip between both. Even if both were only partially open in early Dec the combo would give you interesting variety. They both have high elevation terrain that might help collect early snow. Both have plenty of nearby lodging.
There can sometimes be distinctly different conditions between UT and CO, so if you could wait until last minute you could pick the one that has the best snow. Lodging shouldn't be to hard to find in early Dec at either.