Third vote for a gore-tex uninsulated shell layer- especially when you need to block the wind. I have both an arcteryx LEAF set and a no name surplus set (pants and jackets)- they both stop the wind, but one I don't feel bad about rolling in the mud in and washing it off with a hose. The arcteryx stuff is way lighter, quieter, and more packable which is why the high end mounaineering stuff ends up so expensive.
My problem was always trying to find a good solution for my hands. Gloves I can shoot in don't keep me warm enough for the 90% of the time you're not shooting. I ended up with big puffy gloves while waiting/glassing, and keeping mechanix gloves warm/dry inside my waistband for the 2minutes of shooting.