I am looking for a lightweight, early season (Sep.-Oct), down sleeping bag for highcountry hunts. I tend to sleep slightly cold so I'm leaning towards a 15-20 degree bag. With so many brands (Big Agnes, Alps, Marmot, Western Mountaineering, Mountain Hardware, NorthFace, etc...) and so many models, I am having trouble narrowing down my search. I'm hoping I can get some help from you guys.