TBH in large planted tanks I have generally preferred a LARGE school of brightly colored schooling fish to be the dominant fish. Keeping Discus and plants can be a little tricky, and a lot of work. With sensitive New World Cichlids like Discus and Altums, I've generally had the best results with heavy filtration (Eheim canister or two though a fluidized bed of sand), a thin substrate, and a healthy cover of floating plants, along with a handful of low light ones that were perfectly happy just sitting around and not collecting detritus. Shrimp can help keep detritus off of the plants in my experience. A lot of people prefer bare bottom for Discus, but I hate the way it looks.
When cycling such tanks, I've always preferred to cycle by dosing heavily with ammonia (just plain ole cleaning ammonia, provided it's just ammonia and water. The tank cycles quickly and you end up with a very strong biological filter.
If you want to try SA Cichlids in a planted tank, I'd recommend looking into Apistos, Rams, and P. scalare (not altum) Angels. Honestly I've always preferred Angels to Discus, personally.
Chocolate Gouramis have been my all time favorite "sensitive" freshwater fish, but I honestly think their sensitivity is kinda exaggerated by many. The same could really be said of Discus. They don't die for no reason. Large established adults are actually pretty hardy, but they still demand fairly clean water. If you keep the water clean and feed them a good diet, they tend to be pretty easy to keep happy IMHO.