Warlock build for a duo with a priest

[Concillian]

So if that is the case, so I don't end up with two demonology builds.  What would you duo with a frost mage if you were a warlock duoing with a frost mage.  :)
Edit:  And I do see that the mage/lock duo would have more CC option to eliminate mobs if they wanted to blast single target stuff than the priest/lock so I can see why it could be easier for them to have the weaker tank set.  But with a priest to heal if things go bad vs no healer on the lock/mage it just seems that less tanking should be needed.
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The frost mage / warlock has much better kiting ability than a priest / 'lock for no other reason than your escape / rooting mechanisms are not diminishing those of the other.

I'd say it's easier to go full DPS with the mage, then he can kite, and you can DPS, you can fear during nova cooldown, etc...

For normal mob AoE non-improved void is fine when you have two AoEing, as your DPS is high enough to not get killed. A non-improved void will hold through one blizzard if you use his AoE 'growl' and one torment per target. This blizzard is enough time of you and him not getting damaged and damaging them, that the mage is okay getting beat on a little, he won't die. a frost nova minimizes the damage taken. He can IAE and you can hellfire without worry of drawing aggro because he is well ahead of your damage from the Blizzard, you will catch up to him with hellfire, but shouldn't catch him before mobs die. That will take things down so quickly such that taking some damage is not going to be an issue. You'll get the occasional ranged attacker that is out of range, but that's what death coil, fear and Rank 1 frostbolt are for.

With a frost mage as your partner, I think you could use any build you want pretty effectively. I think priest is a trickier duo, especially on elites. Sure you have healing available, but your escape / kiting mechanisms are not complimentary, plus there are plenty of places where fear is difficult to use safely.