Hello,
Plenty of options for a 150g. You could do your Midas cichlid and silver dollars, and do a small shoal of convict cichlids, for one idea. The Midas would be okay in a 150, the Jaguars eventually get huge which would be an issue. There are other parachromis species that would work however, such as loisellei or friedrichsthalli.
Two cichlids is not a great number, the larger one tends to beat up the smaller one. I would recommend if you want to do a community of CA/SA cichlids, which is possible in a 150, that you carefully pick your species and buy them young so they can grow up together. If you do a community, it is hard to say which fish will and will not work together, as they are all individuals. A decent formula would be
1 Large "king" fish (12"+, midas, loisellei, etc)
4-6 smaller cichlids (6"ish, convicts etc)
6 dithers (silver dollars)
Pleco/catfish
You can tweak it a bit but that is a cookie cutter that has a good chance of working long term. This would be stocked on the heavier side when the fish are adults, so keep in mind large weekly water changes and good filtration will be necessary.