Just went through this search myself a few weeks ago; there are some really great suggestions here but I figured I'd throw a few more into the ring.
Here's what I ended up with after my search:
(Ippo, my Gold Jack Depsey)
Another vote would be for a Nicaraguan (Amphilophus nicaraguense) sorry no pics of my little Nikki but they are a very colorful fish.
Good luck with the hunt and let us know what you end up with!