Buffalo Mountain is the mountain on your right as you are heading west on I-70 past the Dillon Reservoir. It's only a 12er but is a nice hike and the views are pretty decent. It requires a bit of class 2 talus work above treeline after some pretty good elevation gain in the trees. I'd guess about 6.5 miles roundtrip and 3000 feet of elevation gain.
Looks like a mostly dry week is forecasted for up there after Monday. I'm thinking normal winter layers along with goggles, gloves, liners... it will likely be chilly. We may not need snowshoes quite yet, but let's bring them just in case along with gaiters and microspikes.