Which winter shoes / boots are people using?

Well most would say that the ability to put your foot down, and unclip quickly is far more important than any advantage a road pedal gives. When the temps hit 0ish. Have you considered getting some BeBops? Zero centering force like speedplay, MTB cleat, and a nice large contact area.

http://www.beboppedals.com/

You are tynan AICMFP