like you said this is all opinion and so answers are going to vary, but of the cichlids that I have owned I have 2 both of which would need a 75 gallon tank ( I know that you are looking right now) are at the top of my list right now.
Parachromis motagunesis and Amphilious Trimaculatus(sp?)
like I said those were fish that I have owned and can give you honest feed back on their behavior. I havn't owned a Dovii or a Beani so I can't give you feed back on them but have been told that both are wicked mean