Hi, I'm new to the site. I have been reading posts on WhiteBlazes for years and have finally signed up. I have learn a great deal from all that have posted. Well here my question. I am looking for a new sleeping bag (new or used). I have had a NF Aleutian BX 20degree and like the bag but not the weight. What should I buy? I usually backpack in late October on the AT around Erwin, TN. Thanks for any suggestions.