i have had dozens of oscars over the last 15 years; most were sold, a few died, and in my experience with a larger tank if placed in a comunity early on they will do great with a host of fish, jaguar cichlids(much bigger tank) TSN, RTC, silver aro( aro must be about a foot long and its worked for me)again plecos, blood parrots (even thoughy alot of people hate them for good reasons, but a nice fish none the less)chocolate parrots are also great
one thing to realize is there may definitely be some agresson in the tank its all about what you are into.
they are also very dirty fish and require alot of water changes and large filtration system( i recommend 2-3 time as much as you think you need)hahaha
and i wouldnt plan on alot of decorations that arent anchored very well. When they get big they like to decorate the tank as the wish, one day i came to my shop and all the rocks were in a large pile on one end with the decor which the dug up.
any how if any of this info helps thats cool if you already knew this stuff then sorry bro( always here to help with my personal experience)