I thought ARVs came in 175? You have two soft skis, park and pow, so you should replace the ARV with a stiffer all mountain ski in a little longer length... thats just my opinion though.
you wouldn't need both the ARV and the AR6 they're not that different.
I'd tell you to get one armada and the Hellbents... and if you really need that 3rd pair, get a stiff pair for shredding crud. Head Mojo 90, Volkl Wall, Blizzard Answer.