I tend to do 6-7 day backpack hunts and have to have something lightweight. I have gone through a number of boots across the price spectrum but ended up having really good luck with a fairly cheap boot. Last year I used Keen Targhee's (about $140). They have 200 gram of thinsulate and are extremely light and feel like a tennis shoe. I wore them with the heaviest Smartwool socks you can buy and had no problem with warmth at 11000 ft in zero degree weather. Still too early to tell on how they will hold up long term, but my feet were never cold and I had no issues with foot pain. Also, they require little to no break-in time. Not sure they are for everyone, but this is what worked for me.
