Personally, I would spend a lot of time searching for a young Jag that has a nice pattern on its body or picking one out of a bunch of fry, that stands out (is the dominant one of the litter). I find jags to be a much more attractive display beast than any other cichlid that would work in a 75. But that's just me. They are extremely intelligent and have great personalities, but aren't as lazy as fish like oscars. Also their patterns and the purple/bluish sheen of their scales are very very attractive especially when coupled with a black background and dark substrate. Check out Jumbo for an example.