Off the Hook!
I am 5'9, 160 lbs. The Large almost too big, but it's great. I wear it cross country skiing on very cold days, and camping in the summer on cool evenings. The hood is one of my favorite parts because it zips completely over my mouth, but doesn't suffocate as I feel with some other jackets. It's also long enough in the sleeves and isn't too short. It also has a little draw string to cinch at the waste.
Go big, or go home. But with this jacket, you won't even need to.