the monty is really light, so i suggest you go for that. i've heard from friends who have the neverfull that, when you pack it with stuff, the handles tend to dig into your shoulder, since the handles are quite thin...
but, i agree, if you really want the lightest possible bag, LV isn't the best choice. go for your goyard. that's what i use when i'm feeling a little sore in the shoulder area or just plain tired..