...skip on yellow labs or red zebras and get something else, yellow labs and estherae's would have a high chance of interbreeding even with enough females for each male (all mbuna/mouthbrooder could interbreed, but those two species have the highest chances reported in aquaria)....
...Besides, the Pseudotropheus Socolofi are dimorphic, so males are different than females, and I want variety in my tank.
Socolofi's are monomorphic, perhaps you're thinking of a different species?
How's this? 4 Labidochromis Caereulus, 4 Pseudotropheus Socolofi, 4 Pseudotropheus Saulosi, and 4 Metriaclima Estherae.