SoB is probably the best option for Ret tanking.
Since you now have 2 moves that do holy damage that scale with attack power, it would probably be more than justified to drop all spell damage and pick up attack power gear for threat, so scale up the damage and threat from crusader strike and seal of blood. Add that on top of sanctity aura and I'd see no use for consecrate for single target tanking, at least not the max rank.
Also, I didn't see anyone saying this before, but don't forget the usefulness of SoB for tankadins, just besides the fact that the judgement doesn't miss. The damage you receive from SoB and JoB is pretty laggy, and usually comes a second or 2 after your last auto-attack. This means you're taking damage even if you're not hitting or being hit. This is really useful for fights like moroes, or the casters in the second room in Shadow labs, mobs that gouge, incapacitate, polymorph etc... Whenever moroes gouges me, since I'm using SoB, not JoB, I break out of it in a second because of the lagginess of the damage received from it. It only doesn't work when moroes just comes back to you and gouges you the instant he gets in range, if you can't get a judgement off in time.
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