User Review: Marmot 8000M Parka
Fill: 800 fill
I bought this jacket for a winter summit attempt on Mt. Washington (100mph winds, -50* wind chill)
This is a very, VERY! warm parka. It's like wearing a sleeping bag this thing is so warm! I love it, very well made.
To address the wrist thing (in my mind a non-issue) I would suggest putting on mittens or glove liners first, then the coat, adjusting the wrist cuffs, and then your shell layer.
One thing I would suggest in addition is while looking for parkas and other expensive equipment is to look at eBay. I bought this jacket almost new for $300 including ship, so it might be worth your while.
Happy and safe summits!