Mike,
I really like the Mont-Bell Thermawrap Parka, but it does have a hood. I believe the hood-less version of the Thermawrap isn't as warm.
Nano Puff is a good choice and I have really been liking my Nano Puff Hybrid:
http://www.zappos.com/patagonia-nano-puff-hybrid-jacket-black?ef_id=DGVP-6VHJ8gAAB8@:20130213023009:s
You need a shell if its windy, but I always have a shell anyways.
