In reply to Alex Raeside: Lots of good advice here:
-
http://www.ukclimbing.com/articles/page.php?id=4090
I've got the Arc'teryx Beta AR jacket and I really rate it. I prefer it over the 'climbing-specific' Alpha range, because I much prefer the pockets. The Beta AR is pretty roomy, so excellent for going over the top of layers, and has plenty of room for a helmet. I've used it for Scottish Winter mountaineering, Euro ice cragging, Winter hill walking, etc.
Cheers