Herichthys carpintis 'escondido' is a really nice fish. Amphilophus trimaculatus is also nice, if you want something that is more aggressive. A raphael cat will work fine with pretty much anything, give it a PVC pipe to hide in, and if the cichlid tries to kill it it will just hide there all day. Mine hid all day anyway, except when there was food.
A group of gymnogeophagus is another good option.
One of my 75s has a male green terror, a smaller Crenicichla menezesi, and a polpterus delhezi. The other has 4 Gymnogeophagus balzanii, 2 G. sp "paso pache II" and 2 Crenicichla minuano.