N'dru with clusters is really nice, or even a concussion, if you want a longer range attack.

So drop ATP for one of those and a seismic on boba?

Heh, you're not the first person to suggest that. It's one of the adjustments I am considering!

I think giving Seri a Mangler would help her damage output, but really I'm hoping she's ignored and a Mangler wouldn't help that. The only other option I can come up with is: Use the 6 points for an Autoblaster on Boba (and 1-pt initiative)? Risky, but all those rerolls and focuses at Range 1 seem to fit with Autoblaster nicely. I like your idea more, I'd definitely try that first.

What's the best depends on what it is played against I reckon. I've seen some interesting Palob + Opportunist synergies and I've had problems facing off against the Seven Binyare Pirates w/ Feedback Array.

The latter list is an expensive list to fly, in terms of expansions needed, but it is lethal in it is own beautiful simplicity.