As Phat says, it really depends what you are doing in those boots, the terrain (technical/non-technical, temperatures etc.

My winter boots that I use for hiking and snowshoeing are Garmont's Momentum. I use them with both a liner and a wool sock, and of course a pair of gaitors. However my wife bought me some 40 Below overboots for Christmas that I am excited to try.

Both of these I will be using with either snowshoes or crampons.