I like the recovery on the warlock and increased agility/speed can be gained in the latter levels so I'm covered. In addition, I want to be a support objective player and the sunsinger focus will allow me to do just that. Don't even get me started on those high level warlock bonds....
So, two Warlocks and a Hunter? Not a bad combo.
I am still torn between warlock and Titan though, on one hand the Titan fits my play style. Tank, lead from the front, spray and pray. But on the other hand Those warlock bonds look awesome and I haven't gotten a chance to play them either. I may just flip a coin :D