of the options given I chose trimac because Amphilophus are my favorite. Open up the poll and I'd probably say my male xiloaensis (in my avatar). For a non-cichlid fish it would easily be a fahaka puffer, which I also have currently growing up.
In my experience with fish that I've kept, I've always gotten the most discussion/comments over the puffers I've kept and the festae pair I used to have.
Of the choices given I vote Trimac. I love their behavior, size, and color. Dovii and Arowana would require tank sizes that I couldn't provide for one fish. A Pike would be my second choice, but I don't know if I would exactly choose an orange one.