Those species you mentioned are typically less aggressive than other mbuna, although there are exceptions (for example, in my tank my yellow labs are more aggressive than my zebras). Aggression can vary between individual fish and set ups.
You can probably minimize aggression with a variety of other mbuna species by: having more females per species than males (1male per 2 to 3 females); not understocking; and by getting them all at the same time while they are young so that the hierarchy is established by the time they are matured.
You may want to refrain from getting kenyi, auratus, and chipokae.
Sometimes balances can be achieved in certain set ups. For example I have a feeling my socolofi's would be 'bullies' if I didn't have my red zebras to keep them 'in check' (meanwhile my red zebras, while highly dominant, are fairly peaceful and seem motivated to keep the peace).