I use 700x32 inverted tread tires in the winter and they work fairly nicely. They have the advantage of cutting through the snow like slicks, and they have some bite when cornering like knobbies but they don't get clogged with snow. I think mine are the continental cityride. You'll be glad your tires are at least semi slick for all the days where the roads are clear and dry (usually the majority of the time).