Get Nokians from Peter White. They have carbide studs. Nashbars are steel studs. The carbides don't cost much more and they will last you several winters; the steel ones probably only one.
Last year we had an ice storm one morning; I could barely walk on my driveway. At work, someone saw my bike in the stairwell and said "YOU RODE YOUR BIKE IN THIS????" I replied "Well, I sure wasn't going to drive my car, I'm not stupid." If I had to drive, I wouldn't have worked that day.
In reality with the Nokians, I can ride fine on surfaces that I can't walk on. The only real danger comes from cars who shouldn't be on the road, sliding in to you.
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Work: the 8 hours that separates bike rides.