Lessee...a few that haven't been mentioned yet:
Steamboat. Real town with services, snow usually reliable (but not this year), generally mild climate, excellent hot springs, mountain biking, backcountry, etc. Whitewater park in the middle of town. Downsides: Minimum 3.5 hours to a major airport, few trees and many dying or dead (pine beetle), too many tourists who think the locals' only purpose is to be of service to them, Steamboat Lake 25miles north of town is the only real body of water. Steamboat is relatively low elevation for Colorado, and will have increasing trouble with snow as the climate warms.
Sandpoint, ID. Real town with services, more down the road in Coer d' Alene, snow usually reliable, generally mild climate, major lakes, excellent summer activities, reasonable real estate, Idaho panhandle has relatively low population density, decent airport in Spokane. Downsides: Major train center with frequent trains shaking houses anywhere near the tracks - and lots of places are near the tracks; major commuting/traffic problems because of the highway through town, and the Idaho Department of Transportation solution to highway problem may have major negative impact on downtown; snow can be wet and the ski area foggy (artifacts of low elevation); snowfall may become less reliable with warming climate.
Fernie, British Columbia. Excellent terrain and generally reliable snow, available local cat skiing, good mountain biking, whitewater, fly fishing, incredible backcountry (it is British Columbia, after all). Some services and an airport an hour away in Cranbrook. Downsides: Not the most attractive town I've ever seen, limited local services, high cost of living, high pine beetle tree fatality rates. The forests in the area don't appear to have the lush density of cedars, spruce, fir, hemlock and deciduous trees common to the Kootenays farther west.
Rossland, British Columbia. Excellent terrain and generally reliable snow, multiple cat skiing operations with a 1-hour drive, great mountain biking, backcountry - all the usual stuff, nice town with good vibe. Downsides: Very small town, limited services; Trail is just a few minutes away, but it isn't much better - the hardware stores around here are very proud of their stuff and they price it accordingly. Low elevation may impact snow reliability. No real airports nearby. Castlegar is known as "Cancelgar" in the winter. Spokane is 3.5 hours away. Real estate isn't cheap; gas and food is more expensive than it is in the US.