I use the thin moisture wicking socks as well, and they work great. Thick wool socks go on over these.

One important thing to remember when buying boots is that they need to fit snugly but NOT tight. Take the socks you intend to use for hunting with you when you try them on. If they are too tight, they will restrict bloodflow and your feet will get cold.

Thinsulate does work well, and some boots come with 1,000 grams or more these days. If you have problems with cold feet, you may want something with 1,000 grams or more. I have used boots with 600 grams while hunting all day in subzero weather and my feet got only slightly cold. I added an insole that holds the " hothands" footwarmers and that worked well until the hot pack runs out then you need to replace it. If I were to sit in one spot all day, I' d want something with more thinsulate than 600 grams.

My warmest boots were Lacrosse Ice Kings, rated for -100F. They had extremely thick liners - I forget what the insulating material was called but it wasn' t felt. My feet never got cold in those, but they were heavy and awkward to walk in.

I personally like Rocky boots. You may want to look over their selection if you haven' t yet. Also many people swear by Lacrosse for a cold weather rubber boot.