pending on the size of the jag oscars and jd you can try them but watch real close might be enough room for them need hiding spots though and i wouldnt even try the others
when the dovii gets real big you should get a new tank for it by itself then ad 1or2 moree medium cichlids in like a jack dempsey but for now i wouldnt add any more
Definatly need a larger tank to keep all those in for life. RTC and Pacu will outgrow a 180 in no time. There's a sticky in the Catfish forum with recommended tank/pond sizes for big Cats and the RTC is the first on there i think.
The temperament of each individual cichlid will determine whether they'll live together or want to go on a killing spree. The Dovii will more than likely need moving too when it outgrows that tank.