Lots of choices here. One that is extremely warm for the weight is the Rab Neutrino down puffy. 250gr of 800? goose down. Not water proof, but quite water resistant in my experience.Packs down pretty small for the warmth, and lofts right back up when you unpack it. Weighs around 20oz. MSRP is 375$ but you can find them for as little as 225 bucks. Love mine.
