Can you suggest a high-quality down comforter for a cold bedroom?

My 15-year old comforter is a fabric sandwich now, with almost no goose down feathers left. They have escaped through the fabric over the years. (I thougth the fluff floating around the room was Milo shedding but I was wrong.) I want to buy a high-quality, well-baffled one that will stay plump and won’t shift.The reviews of the obvious sources (Company Store, Garnet Hill, LL Bean) are all mixed. What’s your experiece been? I am treating this like a long-term investment.