Sounds like a plan. From the pics, I see 2 Oscars, a Jack Dempsey, a green terror, a firemouth, a convict, a blue acara, and a pleco. My advice would be try to get the biggest tank you can, 180-210 would be good. Put the Oscars, green terror, pleco, and acara in there. Those fish I just named are all south American, and tend to live better together than with central American cichlids. The JD, convict, and firemouth, are central. I'd leave them in the current tank, which looks like a 75 or so? Those stockings would probably work out ok. Might have to move things around a bit, you will see the aggression levels change. My main concern would be between convict and firemouth... FM might have to go with the south's in the big tank. But you can play around with moving fish until you get it right.
Just my .02
Good luck!