Oh cichlids they are great and not so great. I have kept many kinds most from South American. They range is all size and temperament. You can keep a nice cichlid tank in a 50gal just don't get any big ones. Angle fish are good starters. What size tank would you be willing to have?
If you want to learn a lot about cichlids of all kinds MFK aka monster fish keeps is the best there are people on there that really know a lot about these fish.