In reply to euanryan:
I've not tried the Charmoz, though I hear many good things.
I do have the trek though and as you say, they are very comfy and probably quite well suited to easy ice snow and mixed. If you are looking to go on on harder sustained stuff you might feel happier with something stiffer.
Perhaps 2 pairs of boots, one for easy and mixed and another for ice is the expensive answer?