I just ordered one of Wilderness Logics XXL TQ's based on Brick's recommendation. I'll also post my info and review when I get it. Hope to hang with it in the snowy woods of the North here next month. I added an additional 6oz. of down fill to mine, which I am hoping gets me down to around the 0 degree mark (Farenheit). I also asked for the foot box to me shorter (from the bottom to where the "Y" split starts, as I am a bit squirmy and don't like the feeling of a mummy bag type situation around my legs. Looking forward to letting you folks know how it works out!
I know not how to aid you, save in the assurance of one of mature age, and much severe experience, that you can not fail, if you resolutely determine, that you will not.
--July 22, 1860