I'm looking to buy a warmer bag (20f/-7c) for a trip to iceland later in the year. I think this temp rating should also suffice for any winter activity here in Australia, even in the Victorian alps, which are my closest mountains. I've not camped in the snow before, but it's something I'd like to get into.
As such, I plan to spend the right money once, and am looking at WM, Nunatak and Katabatic. Obviously one of these makes bags, and the other two make quilts (with some exceptions at N). Enlightened Equipment is also a maybe, but I think I want a sewn in foot at these temps.
In summer I use a JRB quilt, which does the job. However, as a broad shouldered 6'3" side sleeper (knees up foetal a lot of the time) I frequently roll over and expose large parts of my back to the open air. No biggy when it's still >40f/5c, but I expect less awesome when it's down to freezing. Below are my rationale with the 3 brands I'm considering:
Katabatic (Alsek) - cool attachment system should stop sides coming up, but narrowness of bag sounds like it may cause problems for my knees up sleeping position.
Nunatak (Arc Alpinist) - Attachment system similar to JRB (which I don't use because I don't like it), but *seems* to have the upper body girth for this not to matter. I think I could keep one of their larger bags wrapped around me, and keep some cord handy if it's really cold.
WM (Aplinlite) - basically a 100-200g penalty to be fully cocooned and have no concerns about drafts because bag can move with me. Still opens right up for warmer nights, although hood is attached so it's less versatile in that way.
Anyone in a similar boat make a similar decision?