I'd get a ridiculously expensive PA (think Digmoda powered BFM rig from SpeakerHardware) and a set of super high quality IEMs for the whole band...and a pedal board full of Markbass pedals, a Turbo Tuner, and maybe an EHX Pog.
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Dingwall ABZ 5
Lots of pedals
Markbass SD1200 -> fEarful 1515/66 (or TC115N) Red Complex