What's in a good all purpose city commuting winter tire?
Your best bet for all around tire in the winter is going to be a cyclocross tire. They are made to race in grass, snow, on pavement, in sand, singletrack, and just about any way possible. They also have different types of treads for different conditions. You can't beat the Hutchinson Bulldogs, if you are looking for something more affordable, maybe the Maxxis Locust CX. CX tires offer low rolling resistance in the center of the tire, and have good grip on the sides. A less aggressive tread would be found on something like the Kenda Happy Medium. Give those a shot this winter and you shouldn't be disappointed.