I hate planning ski trips this time of year, because the snowpack can change so dramatically. There isn't anything in the PNW right now, but they could have a 100" storm without warning.
You can find some good deals on lift tickets at Liftopia.com
, sometimes you can find decent package deals at ski.com or ripleysadventures.com. A good option is to get some tickets for an SLC resort through liftopia and then just priceline a hotel in downtown Salt Lake.
If possible you should try and push your trip to the end of your vacation. The second half of December is always much better than the first half.