You can't go wrong with Oscars! There are many more beautiful kinds than the typical LFS varieties. Wetspot has Crassipinnis Os right now that only get 8-10 inches, and are gorgeous! I LOVE mine!! If it were me I'd do them, with some Orange Spot Acaras, some kind of eartheater (Steiny, and Satanaperca sp are my faves, though Guinacara, and more traditional Geos like Redheads are also nice), and top it off with some Festivum for the top and Pictus catfish for the bottom.