Don't really care about fry or breeding, if it happens, it happens; survival of the fittest. I tried the breeding/rescuing thing...it was satisfying, but ultimately too much work and I'm in a tiny apartment so I don't have room for grow-out.
Color and variety is what I want. There's no cookie cutter for 120! :lol:
If you want "no trouble" then I would stick with mixed gender groups. All male would get you more variety but requires a lot of tinkering.
For a little more variety, you could keep at least 4 species and maybe 5. Something like this:
1m:4f Metriaclima estherae
1m:4f Pseudotropheus socolofi
1m:7f Melanochromis cyaneorhabdos (Maingano)
1m:4f Iodotropheus sprengerae a.k.a. Rusties
1m:4f Labidochromis hongi
Chance of getting male versus female is 50%. So to get 1m:4f I would buy 8 fish. To get 1m:7f I would buy 14 fish. Maybe a little more on the Maingano since they are very aggressive and you really want to get those 7 females.