Tough call even here in Utah the only resorts with any significant terrain open are Brighton and Solitude :-( sounds like more big snow rolling in for the holiday so hopefully that changes.
How about Wolf Creek?
Wolf Creek is like a five hour drive from Beaver Creek.
If the OP is able to change plans then by all means go to Wolf Creek. It's 100% open and has good coverage.
If you're staying in Beaver Creek regardless, Breck, Copper, and Loveland will have the most open. Loveland is going to be the least crowded, Breck the most. Of course if you have Vail resort lift tix, they are probably good at Breck too.