I've got a spare slot in my shaman team and I figure I might take this opportunity to level my warlock with them.

I'm wondering which spec to use that would complement the shaman.

I'm leaning towards demonology, for soullink, felguard and demon form. Very simple spells.

I've discounted affliction due to it taking time to kill, which doesn't seem very synergistic with the shamans nuke it quick style (plus I've always viewed it as a very mobile style of play - drive by dotting). Of course the instant howl of terror would be nice.

I' m just not sure about destruction. I've never had too much success with destruction in the past, but it's been a very long time since i've played the lock and destruction has changed so much I'm not sure if it would be much better now.

Does anyone have any experience mixing warlocks with shaman for pvp?
Anyone with more recent experience with warlocks give advice on destructions viability?