Cichlids are always rewarding to keep. I don't know if you've kept them before, but if not I'll give you warning - once you do, you never go back! (Unless you don't research, in which case a fatal disaster may throw you off them)
Mbuna are readily recommended, and georgous fish, but I will be the one to warn you that with these you are dabbling with very aggressive fish, so lots of research, and experimentation, is necessary for success. If you like a nice, relaxing and peaceful setup then I would certainly not go near these guys, but there are many cichlids that would still work, both from Africa and the New World.