LHT daily rider here, and I find the discussion of saving 100 grams on a double to be laughable. I absolutely love the bike because it's a big heavy workhorse.
I'm continually adding weight in fatter tires, lights, racks, panniers, pump, Brooks, etc. Can't say I ever notice the difference.
I rarely use the small ring, but I'm sure happy it's there when I need it. I say go with a triple and a nice wide range front and back.