large predator tank

Question
I got a 250 gallon fish tank running for a month, I still haven't made up my mind in putting what in there yet, I was going to run three groups I thought of with you to see if these fish are compatible.

My three decisions
1 Managuense Cichlid (Jaguar Cichlid), 1 Peacock Bass, 1 Silver Arowana, 1 Lima Shovel-nosed Catfish

or

1 Managuense Cichlid (Jaguar Cichlid), 1 Peacock Bass, 2 Oscars

or

1 Managuense Cichlid (Jaguar Cichlid), 1 Peacock Bass, 2 Irridescent Sharks (Pangasius Sharks)


I plan on getting them at the same time and getting them when there all young and around the same size, I know a store that sells all these fish over where I live.  Can you tell me each one if they are good ideas or bad.  

Answer
Alright! thats what I like to hear! All of those combinations will be fine, just make sure the peacocks don't pick on any other fish.

Personally, if a freshwater stingray is legal where you live, I'd do combination 1 and add a ray. It's completely your choice though. Some people don't like, can't legally have, or are scared of keeping rays, and I'm fine with that.