Welcome to Epic. Don't stress about a "correct" binding. Virtually all modern bindings will do the basic job of releasing you properly, and several come with 115 brakes (try online sites such as Level Nine, Universal, fleabay). So it comes down to weight (you want lighter for a pow ski if possible) and personal preferences about release, durability, ability to transmit force to the edges. I think highly of the Tyrolia Peak 12/Head Mojo 12 (same binding) for your weight, especially in pow, because they're light and have a heel diagonal release for twisting falls. Easy to find the 115's for it; only oddity is that Tyrolias are easier to order online (try fleabay or Google it) than find a store that stocks them, even though they're one of Europe's more popular bindings. Not so impressed with Look PX's for pow because of their weight, although many like them for their elasticity. The old pivot heel P12's would be perfect if you could find a clean used pair. The new Pivots are too beefy and expensive for your mission. Salomons are classic, reliable. IMO enough Atomics have had reliability issues to suggest a pass on them. The Marker Griffon is light and super easy to find, some don't like their design for wider skis, others think they're fine.