I would go mbuna and did! Mbuna just work better in a 55 and there cool for a tank that size because its reccomened to over stock! As long as you over filter and keep up on water changes. Haps just grow to big to keep in a 55 for life imo.
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you could do peacocks but it would have to be an all male or species tank to prevent inbreeding and spread the aggression, in a 55 mbuna offer more colour and options then haps
The Haps would outgrow your tank. I have a livingstonii that is about 1 yr. about time to move her into something larger. My Mbuna max out at 4-5" so not a problem.