Cool.

Well, first I second food's recommendation - the larger Northern Lites could be a good match for your conditions and size. Since you won't be on steep traverses and mountain climbing (at least not too often), I think those are a fantastic choice. I have the Backcountry and Rescue models and love them.

There are other models from Atlas and TSR I'd recommend if you want something more substantial - their very largest ones, which have more aggressive crampons and more sophisticated ratcheting bindings - but I've not had a problem with durability (or any other issues, for that matter) with the Northern Lites.

Here's the model I'd recommend for you:

http://northernlites.com/tundra.php

Enjoy...