Tankadin?

The Tankadin is a paladin acting as a tank, plain and simple. There’s a huge argument always waged over how effective a tank a paladin can be, and the answer is quite simple: you can tank. How well / poorly you tank in relation to a warrior? Irrelevant, you tank in different ways that should not be compared. For instance, a paladin can AoE tank multiple trash mobs, something a warrior has a great deal of trouble doing. A good Prot build also allows for single-target damage return tanking (with Retribution Aura, Blessing of Sanctuary, Holy Shield, and a shield spike your holy damage return is pretty high). Holy damage is the threat generation source for a Tankadin, using Consecration and Seal of Righteousness are extremely powerful for it. Improved Judgment and Benediction allow the Tankadin to fire out even more holy damage and still conserve as much mana as possible, not to mention Righteous Defense, our equivalent of a warriors taunt ability.

The macro below, while tanking, will allow you to use your Righteous Defense and grab the mob back if he decides to stray, similar could be created with Protection for those inevitable "NoOOoo Not the priest!" moments:

/cast [help][target=targettarget,help] Righteous Defense

Crushing blows you ask?

Copy and paste this into a macro and run it, it'll show your total avoidance+mitigation (assuming you have the 20 defense from the prot tree - Anticipation, if you dont, just remove the 20) This is handy for calculating after common buffs such as Kings/Mark on the fly, so you don't have to keep running numbers all day. Excellent when making gear choices.

Just remember, you need 102.4% combined mitigation/avoidance to be uncrushable vs a level 73 mob/boss.

/script DEFAULT_CHAT_FRAME:AddMessage("Need 102.4 combined avoidance. Currently at:",0.8,0.8,1) /script DEFAULT_CHAT_FRAME:AddMessage(GetDodgeChance()+GetBlockChance() + GetParryChance() +5+(GetCombatRatingBonus(CR_DEFENSE_SKILL) + 20)*0.04,1,0.5,0)

Unfortunately i cannot take credit for the above macro, it was taken from the WoW Paladin forums, but it really does work well.