Peacocks are easier I think because some mbunas are really aggressive. You can look into getting some of the milder types to start with such as the electric yellows, electric blue mangano, white top hara an many other types are relatively peaceful and can be kept with peacocks, then you will be able to do more variety. Be careful with the red zebras and other types of metriaclima and melanochromis they sometimes have a little too much personality lol.
I don't know who told you mbunas have no personality... cuz they sure do!!! Your gonna love watching them! R you gonna do all male or a mix?
all cichlids have personalities that I have found and I've just had oscars and african cichlids, I have a mixture of mbuna, peacocks, and haps.