If anyone finds themselves in soho this season, the Uniqlo store has a line of down jackets that are REALLY impressive for cheap cheap.
I am in town for work, and I just happened upon them. they are $50 for the lightest version which is very comparable to the montbell down inner jacket (no hood). I estimate it weighs 8 oz. crazy light for a company concerned primarily with fashion. The down feels like it is very high quality, no quills that I could feel (and i am sensitive to them). I would estimate 750-800 fill power, certainly nicer than 600.
In addition to that jacket, they have a slightly warmer version that probably weighs 10 oz. for $70 with no hood. They also have some synthetic fill jackets that come VERY close to the thermawrap jacket for the same price.
ALAS, i did not purchase one of the jackets as it didn't really fill a jacket need for me. but if i was in the market for a down inner, and was hesitating at the price, I would have definitely bought the jacket.

