I just got Foster Gray and since pairing him up with other Fanged gunslingers is a terrible idea, I thought about whatelse would work with him, and came up with flying venom, which the Rancid bloodsuckers oddly enough have

Foster Gray
Corrupted Priest**
2x Rancid Bloodsuckers***
Rancid Bloodsucker**
Rancid Bloodsucker*
Fell Reaper***
Imp**
300pts.

Foster leads the bloodsuckers in formation with the priest giving them the 17 defence and healing. The reaper is a body guard or weakens the Toungness figs so the venom can flow. I know a titan would probably rip this apart but there is the ability for the suckers to do a bit of swarming or formation attack. Let me know what you think.

Don't forget your army can do 9 damage to the Titan the turn after you base it with your Bloodsuckers, if they haven't been hurt and you use all your actions.

Looks pretty nice and solid, but its almost 1 AM so I don't really know :D.

Venom is a doubtful way to go right now ,
especially with all the Chariots and OSTs out there
who are immune to venom.

Perhaps trading the ** rancid for a *** feral would give you a little more punch against titans or high defence toughness enemies.

The Fell Reaper isnt a bodyguard - I think you mean the Nightmare Reaper, the charger (Nightmare Reaper on Nightmare, not Fell Reaper on Skeletal Fell Beast), right?
A tough Feral Bloodsucker would be another means to crack some shells (11 attack with WM). The Feral Bloodsuckers are quite an idea to pair up with Foster Gray in general, as is Jess Blacklock. You could let him move in front on level 4 (LI).

Yeah, I did mean the nightmare Reaper, I always mix them up when I talk about them. A Feral might be a good idea, but Jess is a little disapointing to me, mostly because of the way they set up the vampirism/Berzerk at the end of her dial, and the necromancy is a waste so I wouldn't use her at level 5. Of course I am still going to get one when it comes out.