I will probably going on a 4 day trip in the Smoky Mountains N.P. at the end of the year. Temperatures can vary but I am to expect around ~0*F at night, 20-35* during the day.
I have decided to order a W.M. Antelope MF 5* bag. What I need now is a decent down jacket. After reading the multi-part State-of-the-market Report earlier this year, I am torn between the Mont-Bell Alpine Light Parka and the Eddie Bauer First Ascent Downlight Hoody.
For colder temps while hiking, I plan on layering a 200wt merino wool, M.B. Thermawrap synthetic jacket, and a rain jacket (if needed). Bottoms are regular convertible pants and 200wt merino, smartwool socks with silk liners. The down parka or hoody would be used in camp and stops.
Is this a pretty good system for these temperatures?
I am leaning more towards the Alpine Light Parka due to it's more rugged fabric. I wear a medium Thermawrap. Would a large Alpine Light fit good over my other layers?
Can anyone provide a good in use comparison between the down jackets? Any comments on my insulating system would also be great.

