you could try Cerberus collar (+320 OA)
but is a sword really better? spear doesn't require any additional strength.. kthonian spear with anubis wrath?
I think a sword is better for this specific build, because you will trigger the shield procs from defense more often than if you were using spears. Unless you can cap attack speed with a spear, in which case that would be better ofc, but that's quite hard to do with a Paladin as they get no bonuses to attack speed from either tree.