This would be so much easier if all my picture links weren't broken cause I would refer you to my 72g planning, building, stocking, running threads that I invested so much time into. I shake my fist at you photobucket! *clears throat* Anyways...
Mbunas are beautiful fish and can be quite enjoyable. Things to be aware of though... a 60g is about the smallest you want to do a mixed Mbuna tank in. They are SUPER aggressive once they mature. To get the most color with the least amount of headaches I'd suggest something like a demasoni tank maybe with some yellow labs or syno cats. Or a Saulosi, rusties and syno cats. My favorite mix is yellow labs and acei but with you're tank only being 12" front to back I wouldn't suggest acei. If you really want to go with Mbunas take it from me, get a bigger tank. You do that now and everything else will be MUCH easier! I wish I went bigger than a 72g for my mixed mbuna tank or just did labs and acei, maybe rusties too and syno cats.
If you do a more mixed species tank be prepared to do a fishless cycle then buy a ton of young fish to grow up and then divide them into breeding groups of 1 male to at least 3 females (more females better) and then possibly have to change the stock or individual fish many times till you get a group that works well. A good local fish store is so helpful here, mine would not do ANY trades or donations EVER. Or you can go with an all male display, same idea with cycling then buying tons of fish but then separating them into best males only while keeping some back-up in case of death or one being too much of a bully. I find this way even harder though. And I could go on and on but I'll leave it at that for now till you decide if you even want them lol.
No matter what african cichlids you pick be prepared for work. Either dealing with aggression, switching fish in and out, time-outs for fish, rearranging the tank, tons of water changes, slow growing fish etc etc etc They can be big commitments but very rewarding as well.