I recently took the plunge and got some winter boots after years of denial, was torn between Shimano (MW80) and Specialized (Defroster) as I know both brands are a good fit for me in general. Tried both on, felt lovely, bought some Defrosters in the end as they were going cheap somewhere a while ago (Evans maybe?).
I wore them yesterday for the first time (commute, weather OK) and was very pleased. Obviously time will tell how warm/waterproof they really are but they might be worth checking out also.
I always thought Northwave were quite wide?