Haha now that is the million dollar question.
You will get very varying opinions on the subject "Which continent"
Had you asked me 6 months ago I would have said African lake Malawi cichlids.Particularly haps such as Malawi eye biters,Blue dolphins,Electric blue haps,Venustas and Livingstoni.They get big and in my opinion are majestic fish.
Now then you have African Malawi Peacocks.
Beautiful extremely colourful fish with long flowing fins.Very showy as the name would suggest.
Then you have the boisterous mbuna also from lake Malawi.Very few get over 6" in length and they are plenty colourful but perhaps a little too territorial.They are always jockeying for position.
These days I am starting to sway towards the central and south American cichlids.Less fish in the tank but they look awesome and full of personality.
Hope this gives you something to think about.