WARNING: Once you get cichlids there is no going back, you will be hooked!
Yes, Rams, or any dwarf riverine cichlid for that matter would do well enough with them. Oscars get really huge, and so aren't the most ideal choice IMO, but one would work. Personally I'd go with a breeding pair of something smaller and calmer, I find it more rewarding to keep them this way anyway. My Nicaraguensis are charming and share their 90 gallon with congo tetras, but SD's would work just fine with them too. Eartheaters like Geophagus varieties are very cool too and would do well in that environment.