if your looking to house them for life in that tank i'd hold off on the indo dat. Oscars are played out but like adrianm said they are really cool fish. we have an oscar who was pushing 12" in a 55g. We upgraded to a 240g and once we got him in there he became a lot more active and shows a lot more personality. He swims right up to the glass to greet you whenever you walk into the room. With that being said, I think there are plenty of better looking large CA and SA cichlids that I would go for next time. Dempseys, female red terrors, jaguar cichlids, wolf cichlids, etc. It could be cool to stock it with a few more smaller cichlids like severums. They still reach a decent size and would be very colorful. Just depends on the look your going for.
The Oscar is a "must-have" for me, precisely for their personality and beautiful coloration. =) Agree that there are alot of other cichlids that are attractive but I just have a soft-spot for Oscars. Heh. Thanks for the post though. Appreciate it.