Telluride is the place to be for sure, but it's way in the southwest region of Colorado. If you're looking to go more west I'd suggest going around Summit County. You'll have Abasin, Keystone, Breck, Copper and Loveland all fairly close to each other. Vail is only half an hour away as well. But no matter where you go there will be plenty of powder in December for you to enjoy!