Yeah, I kind of agree, I love oscars and their personality, but I've had just as interesting fish in Severums etc My biggest personality fish have been the Red Devil cichlid and Green Severum. An excited Oscar is awesome though! Especially at food time.
But anyway back on topic hehe
Those other fish seem fine to me in the start Simian, but you'd have to watch as the oscar got older (after a year or so), make sure everyone is getting on OK. You'd probably want to replace the bristlenose with a redspot or common plec at some stage (recommend redspot, commons are lazy). Reason being is its possible an adult oscar will try to swallow the bristlenose, only to find out later it has spikes.
Now the african cichlids you have are better suited to a high pH tank, but if you've got them living in normal tap water then sweet as. Might be something to consider before getting more though.
All of the above advice depends on size. Having an adult oscar with a baby Lab probably wouldn't work out, and vice versa. You'd have to give us specific sizes to get a more accurate reply, but you can also just rely on common sense
Remember, if it fits in an oscars mouth they'll eat it, or at least chew it.