Don't make me try!! I don't think africans are more colourful, I can think of many new world cichlids that would give an african a run for its money. Salvini, texas, nicaraguense, festae, umbie, red bay snooks, some geophagus, gold saum, etc. Granted we don't see all of those here. I think africans have a reputation as being more colourful as you can have a heap of small fish with different paint jobs in the same tank so its full of colour.
Anyway, sorry for the hijack, I know you weren't putting down the american cichlids!!