I find discus to be overdone. Sure they are pretty fish, but I wouldn't call them the "kings" or treat them like the end all aquarium fish.
I personally like to be a bit of a fish hipster and have things that other people don't. Get some big fish like bichirs in there, have a monster fish tank that is also planted. I'd be putting in fancy swords like no 2morrow, as well as tons of madagascar lace plants and rare crypts and anubias, coupled with large stem plants and whatever else floats your fancy. You could even have schools of rare geophagus or something floating around in the tank as well. Or, do a riparium style planted tank with stingrays or something.
Really, the possibilities are limited only to your imagination.