I'm thinking of getting a pair of Duluth Trading's "firehose bibs" bibs myself for ice fishing - the ice will probably be thick enough on Hawkin's Reservoir in another month. I don't know that I'd want to wear those "firehose bibs" for walking around, rabbit hunting though. They look pretty heavy.
I deer hunt in Key bibs. But deer hunting for me is not sitting in a stand in the cold. It's a lot of hiking, climbing, some brush-busting, and occasionally sitting and glassing. Besides, I'm usually griping that "it's too darned warm" while I'm deer hunting in October here. So insulated bibs wouldn't work very well for deer hunting for me.