Studded tires aren't that much slower than slicks on icy roads. Any way you look at it a studded tire will be quicker than a hospital stay.
If for some bizarre reason you have your heart set on a non-studded tire get one with inverted tread, like the Conti Town and Country.
EDIT: Conti has also just come out with a new non-studded winter tire.
http://biketiresdirect.com/productdetail.asp?p=COTCW