You really can't beat King of the Mountain Wool but the price is very steep. I have the uninsulated bibs and they are the most comfortable and still very warm. I can't imagine what the insulated ones are like. I also have a pair of Cabelas 200g thinsulate ultimate fleece /gore-tex bibs and if you ask me they are very noisy, very warm, but noisy, especially on those still, cold, late season mornings you know when you can hear a mouse fart at 200yds. Trying to move on a deer that is close can be difficult.
my 2 cents
T