Replying to AR5's vs. Foils

Heres the deal, I can get some last years unused 170 Armada AR5s with rossi scratch bindings or some new Salomon Foils any size with solamon bindings for about the same price. Im gonna be doing park during the weekdays and powder on the weekends. I'm torn because i think the AR5s might be a little too short and they might be too narrow for powder (i think they have a 79mm waist, correct if wrong.) So price besides, do you think the AR5s are not the right size? im 5'11'' and 180 lbs.