In reply to Cloudwalker13:
So as you've noted, warmth is super key. Most of the B1 boots, though comfy, they wont be warm enough, especially if you're in Autumn/Winter and wading through snow. (I've been in Nepal trekking in summer- July- and its been -20C at 5400m in a snowstorm.)
So one option is to go all in on a stiff, B3 boot like the Scarpa Phantom or La Sportiva G2.
Howver, although they are ok comfy and a reasonable weight, they are both major overkill for just trekking, and I'm not at all sure how they'd feel after walking in them for multiple days straight on hard terrain.
In the Alps a lot of folk have been experimenting with a pair of stiff approach shoes for the hard, leg-pounding terrain, whilst carrying a stiffer winter boot that can be whipped out when conditions become more demanding.
I've actually been experimenting with the La Sportiva Aequilibrium ST GTX as a winter boot and have been super impressed with these. They are comfier and lighter than the Phantom or G3 and have kept my feet toasty down to -10C and in heavy snow. Anything colder, then a full gaiter would be recommended.
John C