Need help picking out a new fish

At the moment I have a 75 gallon tank with a 12 inch silver arowana, 2 convicts, small bichir, and an eclipse catfish. They will all be moved to a 125 gallon and eventually a 2-300 gallon tank once I get a bigger place. I would like some ideas. I wanna stay away from cichlids as I've owned most. I'm looking for something different. I was thinking abou a few leaf fish or a needle nose gar. or a african knifefish or butterflyfish.Help me out