If so you can do discus, severum, uaru. You could build a tank aroud one of those as a center piece or do numerous of any one of them.
I have a 110 and when I get my 180 I'm going with the red headed severums and a pair of dwarf pike (regani), a shoal of 20 bleeding hearts, gold nugget pleco and a L???.
Are you putting the dempsey and ebjds in the tank? If so scratch what I said. If your setting up tank and starting with nothing that's one of my ideas. There are really so many diffrent stocking things you can do. Do some research and then stock your tank the way you want it. Nobody can stock your tank better then you.
Now if you are asking for compatibility with the j/d and ebjd then ther are loads of fish that get alnog with them. If you do research and ask others what they think of putting a "blank" with your ebjd and j/d then that is an esier answered question.
I would say step one is find about 10 diffrent cichlids you like then and then research or ask about there compatability. And you will get a load of answers and insight to others experiances. But keep in mind every cichlid is varied in there aggresion level so its a lot of trial and error too.
thanks for the replys,its a jewel rio 400,im hoping to keep 2 jds,2 ebjds,1 oscar,and i was thing a red terror or a green terror,and maybe a couple of convicts as ditters