In reply to mattmjones:
I've owned and repeatedly tested (on actual winter climbs!) both the Jottnar Bergilmir (Neoshell) and the ME Tupilak (GoretexPro) and the Neoshell wins every time for me. For a slim chap the cut of the ME is actually a bit better, as is the hood, but it simply doesn't breathe well enough. Being stood on a cold belay for an hour (you'll do plenty of that), soaked in sweat, is no fun.
The Neoshell breathes brilliantly, is waterproof to the required levels, and you can boost the resistance to high wind penetration by smart choice of midlayer, eg "active insulation" (Nano Air), or combine a light insulator with a wind shirt, which has the additional benefit of helping the layers glide over each other. But now we're slipping into the real purpose of winter climbing: layering choices!!
If you run a bit colder, however, GoretexPro will keep you better insulated from the wind, and might be preferable, in which case, go Tupilak.
Post edited at 07:33