I was going to suggest getting a wild caught of whatever type of cichlid you pick. Their aggression level is higher making them more interactive. Now sure if that's the case with all wc, but mine sure is!
Interesting, I have had the opposite experience when it comes to owner interaction. I have found wildcaught fish have more of their natural insticts intact, which are to hide from potential predators such as people. If you get the fish at a small size and grow them out it probably does not matter, as they live in aquaria for most of their life. But I have found larger wild-caught fish are usually more skittish than CB or tankraised individuals.
Managuense, especially a male, will definitely get too large for a 75 gallon. I would recommend smaller parachromis species such as loisellei for this tank size.Parachromis managuense, but it would be pushing it, but he'd have to be the only fish.
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Not trying to contradict anybody, just putting my .02 in