Why the wish to stay away from Dwarf Cichlids? Rams, Apistos are perfect for a tank like that.
Other options I would consider (my personal taste), are Aequidens diadema, Cleithracara maronii, Laetacara dorsigera and Laetacara curviceps, mixed with Tetra (preferably high bodied), smaller Pleco and Corydoras. You could even have a couple of Severum in that tank, though I'd avoid having the smaller dwarf Cichlids if that were the case, especially if they pair up. That and your plants would get destroyed