For your paladin once your crit immune is to get block maxed out to where you always block, miss, dodge, or parry. Then max out your block rating, I think the cap is 1500 so every block reduces that much damage, then go for stats and AC. Im also on the fence with kings vs sanctuary. Sanctuary does give all your mana back when you block cap, but it also reduces upfrount the ammount of damage you take as well.