New world? That lets out Labeotropheus trewevassae.
OK. Here goes:
Gymnogeophagus rhabdotus. Doesn't get too big. Lots of red (I like red) Fairly peaceful. Keeps the sand agitated so the dirt goes to the filter intake.
Nandopsis salvini. MEAN, MEAN, MEAN. I know. But they're so colorful. Lots of red (I said I like red) bright yellow, and blue, too, when they're spawning. Which is when they'll murder everything in your tank, and eventually, each other. They have teeth, too.
Black acara (Cichlasoma bimaculatum). Not flashy, I know. A great fish for color blind people. But peaceful, friendly, with lots of personality. They swim with such an easy grace that it's fun to watch them. I'm sorry now that I put mine up for auction. Maybe I'll get some more if I ever get back down to Florida.
Altum angel fish. I've never kept them, but the few I've seen have been so beautiful, graceful and stately, I don't see how any hobbyist could keep from longing for them.
Discus. They like it too warm for my setup, but they have such a slow moving charm, discriminating intelligence, and easy grace that I'll always like them.