I switch boots during a hunt also but I use Lacrosse Grange quite a bit. They are a rubber knee high boot - uninsulated.
They fit a lot like a rubber moccasin, very comfortable, always dry. They are odorless which is good for elk hunting. Since they are uninsulated you will have to maintain warmth from the sock you wear. I've never been cold in them. The Grange does not have an agressive tread but is still able to perform well on fairly steep terrain because the fit will contour to your foot.