I just scored a pair of 45Nrth Wolvhammers (the retail gods have smiled upon me), in time for some rather nasty winter storms here. Absolutely fantastic, and miles above using straps/platforms with my wool-lined Keen winter boots. Once upon a time I got bona fide frostbite commuting Albany -> Schenectady in Garneau "winter" shoes with Pearl Izumi overshoes on top; never again do I want to experience the thawing process.

If you're doing a daily commute in sub-freezing temperatures on a consistent basis, I would heavily recommend considering either the Lakes mentioned above by tsl or the Wolvhammers.