I keep Oscars, peacock bass, a Saxatilis pike and severums with my limas, i have also had earth eaters (Satanoperca/geophagus) and acara's in the past and have not had any problems with any of these fish. The Cichlids to avoid are Central American and African species which tend to be much more aggressive than their South American cousins.
I also keep stingrays, other medium/large catfish, bichirs and a arowana with them too.