Hiya churnHS, welcome to MFK.
There are a lot of chouces, just depends on what kind of fish you like. 5-6 rpbs, a community' shelldwellers, one gulper cat, lots of choices.
It would be easier to list no-nos like more than one rhom, p-bass, aros, rtcs, pacu, lmb. channal cats, or gar.
Ever thought of doing a 'silver themed' tank.. Perhaps a shoal of red-hook silver dollars, a small group of pictus cats or columbian sharks, and a single silver arowana? Of course you would have to move fish once they outgrow the tank, but it could make a beautiful temporary display that would be quite active and impressive.
An oscar,pictus and pleco.
Heavily planted with 6-8 Angelfish and some cories
planted with 50 neons or cardinals and some cories
pair of jack dempsey or other medium cichlid
And im just warming up!!
I like the Exodon sugestion....they have been one of the most interesting fish I've kept. They like a deep sand bed wih a little river rock and driftwood.....and of course a few live plants.....makes for a real nice natural looking tank.