Taunt auras don't take taunt sets anymore.
For taunt, it varies. The Mocking Beratement set is good for ice tanks since it gives extra S/L defence with two slots, while other primaries probably benefit more from Perfect Zinger's +regen and +recharge. I wouldn't really put more than 4 slots in taunt, although if you go for full 6 you'll get some more nice bonuses from both sets.
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Other than "son of a window-dresser" (clicky)...
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Your not Maelwys on a second account are you? 
Generally for an Invuln; I would knee jerk and say if I were to complete an IO set in slotting I'd go for Mocking Beratement. I'd actually mix it myself 4 Mocking 2 Perfect but it depends on what you want and what the rest of your build is like.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
Personally i 5 slot taunt with Perfect Zingers(all but the proc) mainly for the bonuses and it gives a good percentages to recharge/taunt duration with some accuracy and range thrown in not that accuracy matters if you don't pvp 
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I personally love the Perfect Zinger Proc in my taunt. I use the 6th slot for a recharge IO. The amount of times I've managed to kill stuff on the last sliver of health, using taunt is great, and its just a no end, rather in accurate cone attack that does psi damage. A great proc to have!
Procs are the spice of life.
Could someone link me to that Perfect Zinger set? I can't seem to find it on Red Tomax's otherwise marvellous site, and that psionic damage on Taunt chance intrigues me quite some 
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Much appreciated!
I managed to get a 'chance for stun' proc - no idea of the set without looking but it fires off quite a bit, so makes taunting EBs and Bosses (yet to fight an AV with the tank) that much easier for anyone with immob/hold etc attacks. Plus the tank is Energy Melee, so it helps build up the stun, which is always good.
Other than "son of a window-dresser" (clicky)...
...what's the best Invention to slot for Taunt and in which powers? (I have a Taunt and my Invulnerability aura)
Is it time for the dance of joy yet?