For those of you who have never purchased from Tire Rack, I thought I'd share a link they sent to those owners who opt for periodic emails. I think you will find the winter testing results they performed at the arctic circle test facility a bit interesting, I know I never would have expected a Conti tire to perform this well. I didn't go to see if they have any that meet our needs, but I figured this would help with other cars.
Winter Testing at the Arctic Circle: Studless Ice & Snow
Test Report
Test Results Charts