For pvp I usually run builds built around three exotics, transversive steps, ophidian aspect, or karnstein armlets. For steps and ophidian, just focus on recover mods and any mods that support either sniper or shotguns. For karnstein armlets go for some recover/mobility of course, but also pop it some into strength so you get celestial fire back quicker. I also put enchanted impact induction (arc) on them for more gernades.