I'd recommend a VBL sock to prevent the boot from getting wet from perspiration on day 1
nartreb wrote:See, this makes no sense to me. Why let your feet sweat that much in the first place?
I just can't help it! Wish I could tell my feet not to sweat - that would be awesome.
An approach usually starts in much warmer conditions that the trip objective. It's the objective that dictates the boot choice - thus too warm a boot on approach, thus sweaty feet, thus a VBL to prevent soaked boots (Nepal EVO's are very hard to dry out).
Or double boots with a liner that you can dry at night.
Works great for me, but maybe not others.
nartreb wrote: I'd much rather have boots that I know fit me comfortably and are broken in.
Given the choice - I'd much rather have my toes than comfy / broken in boots
OP - to natreb's point, only you know your feet's tolerance to cold. Throughout the winter (before your trip) asses your lower temp limit with your Nepals, consider sweat issues that come with overnights and a single leather boot. Make your decision based on those facts.