Thats nice. So did I. Until one day they all were eaten.
Thats true and I shouldn't have said that. However, if there is a possibility of the fish not working together that should be at least mentioned.
I would definatley skip the jewel cichlids. If you end up with a breeding pair they can be quite dangerious...even to the larger fish. I would suggest filament barbs, they have bright red markings on their tails and as they get older end up with a rainbow sheen to their silver scales. Very active and friendly fish.
I have these barbs in my 190 and they work really well as dithers. Very pretty fish. Mine are about 5". They are housed with a 8" Location X Umbee, large green snooks, F1 Peru Oscar, large Grammodes and a large pantostictus. All get along well.
Here is a link to their profile
http://www.seriouslyfish.com/profile.php?genus=Puntius&species=filamentosus&id=180
and a pic