fire warlock

[Concillian]

Others

Other options would be improving my VW, Improved Drain Life, Improved Health Stones, Improved Shadow bolt....actually I just thought of the shadow bolt one.  Putting 5 there would give me a decent option for when fighting fire immunes.  Not a horrible idea.  That should probably be put up there with the other main ones I suppose, but I'm not adding it cause I'm lazy. : )  Something to consider though.
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Imp. Shadow bolt isn't all that useful unless you're spamming SB, IMO
I'd say Void for PvP AoE. Especially if you're with a group. A void shield basically enables the use of Hellfire with only a small penalty, It's the highest DPS AoE skill available, and it's much less noticeable than IAE. You can really disrupt the other team through use of Hellfire. If your own team also has a mage who you're coordinating with, it's incredibly powerful. You can both go in together and the mage with IAE usually draws first attention, giving you some time to Hellfire uninterrupted.

That's my preference, since three points adds quite significantly to the power of the voidy sacrifice shield, and you get res'ed with a free void everytime anyway. Just have to watch out for priests who will dispel it. Sometimes you get attentive priests who will dispel in group situations, but usually thy are focusing on their own group members. I generally only find it an issue in 1v1 or 2v2 scenarios where a priest will dispel the shield.

I would avoid improved drain life without having the uninterruption talent. Seems kind of pointless to me.