For what you are looking at I would recommend the Triolet or Mavericks. The Mont Blanc is an amazing boot, but it's pretty stiff for long approach hikes and non-technical climbing. As far as warmth it kind of depends on the person. I have pair of Charmoz that I've climbed Mt. Baker in early June, Adams in late October, and some mid-winter climbs of other north cascades peaks and been fine. My feet run naturally pretty warm though, some peoples feet get cold a lot easier. The Triolet is going to be a little warmer than the Charmoz, so I would think you'd be ok. I haven't seen the Maverick yet so I don't know about that one. Hope this helps!