thats lots of space, I tend to find that oscars get their asses kicked by aggressive cichlids like Parachromis and Amphilophus sp. but I've also seen people that have made it work. I have also seen aggressive oscars. I kept my pair with a Lima Shovelnose catfish. and the little one eyed oscar im growing out lives with a male Gymnogeophagus Steindachneri and they get on fine although the oscar is pretty aggressive to him.
what is the temprement of your oscars?