More diverse perks on more armor. I love iron banner gear for giving me scout rifle perks, but I'd be even happier with perks like... Gloves that increase stability on xxx weapon. Helmets that improve zoom on xxx weapon. Boots that increase jump or Sprint speed. Chest piece that reduce jarring effect when hit... Little customizations like that could go far. And frankly, I don't care about grenade/melee energy perks...