Would you be looking to upgrade later on? I like PBass hence my name, they are predatory you could use the tank as a grow out for them.
Edit: You could also do a Datnoid.
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I'm in a simular boat been ask about a 90 so far raindow wolf fish and exodon have gotten and should work for your tank as well the exodon you can have a decent shoal of them so wiuld still have movement
If you plan on upgrading to a 120+ a fahaka puffer would be awesome. My 3incher follows my finger and has more personality than any other fish I've kept (sorry oscars).
Some bichirs. They are interesting, predatory, and you can get several species that fit in a 75g for life. They go well with ctenopomas which are also interesting and predatory.
Iam currently shopping around for a 180 or larger so it would be a grow out. My only concern is I would like to end up with a tank that has a shoal so there is movement. Thought about payara have any of y'all had experience with them. Good or bad