I would suggest checking out first lite. They are coming out with a new 10.9 ounce 800 fill jacket called the Brooks Down Sweater. It should be available to purchase in June if I’m not mistaken. Their Chamberlin jacket is what it is replacing and I know that one is amazing so looking forward to getting the new one
The Brooks isn't replacing the Chamberlin. It's an ultra light model that will be offered in addition to the Chamberlin. The Brooks won't be near as warm as the Chamberlin either, but will be a good jacket for temps down into the 20's probably. The Brooks is very similar to the Eddie Bauer Microtherm 2.0 for anyone looking for a quality budget comparison.