Upon mulling it over I think that adding a druid either Resto or Feral might gimp the effectiveness of the team.

Specifically in situations where I want to use vanish - and having a kitty that can't really restealth until out of combat either standing there and taking a pounding or acting as a huge neon sign pointing to my stealthed rogues isn't great.

I'm thinking of being able to vanish all of the team at the same time, all attacks being completely synchronised.

I'm thinking that I will probably get a 4th rogue so it's a one class/same spec group and resign myself to being a crack suicide squad. If one dies the others are going down fighting