Alright, I know specs are/have been covered at length - so if you don't want to reply don't worry there's no obligation

I currently run a Paladin, 2xMage, 1xWarlock, 1xPriest team. Because of my team composition, I was thinking of this:

http://www.wowhead.com/?talent=IiZf0IuIVz0eskVxbz

As a spec for the warlock. I am interested in Shadowburn because it matches well with my "finish the mob off button" - Fireblast on the mages with SW: Death on the priest. I mainly want Demo spec because I love the off-tank elements. My mages seem to handle the DPS pretty well, though lately when I figure in the pet to the total damage contribution my warlock actually out-damages the 2 mages.

Comments? Recommendations?