Sune is a good fit, but she already has an order of LG paladins, as mentioned. Other than that, I agree that Tymora and Lliira are good fits. I think you're applying too strict standards to those gods anyway - after all, Azuth and Chauntea have their own LG paladins, so the precedent is there for not typically "paladinish" deities having paladin orders.