What will you be doing with the Duke? If he is staying with the Kabalites, I would consider dropping the Sybarite. I know people think you should always have a sergeant, even with an IC, for tanking challenges, but I find that I want my ICs in the toughest fights anyway, and that a 2++ is about the best way of dealing with a Powerfist I can think of.
(I'm no tournament player though)