Winter can be brutal on the feet, this is what I use and have been warm/comfortable down to -40 below (wind chill) in the rain/sleet/snow in the Dakota's.
1.
http://www.zappos.com/chippewa-11-bl...-engineer-boot
2.
Amazon.com : Sno-Seal Leather Protector All Season 7 Oz : Sports & Outdoors
3.
REI Merino Wool Hiking Socks