Since you are ready have a dwarf pleco, I dont think another one is necessary. But, since the Clown pleco is not the best algae eater, you could replace it with a rubberlip or a bristlenose pleco, IMO
they are better algae eaters.
I think you need a Centre piece fish to finish up the tank, Have you considered a Pearl gourami? What about an apisto or Dwarf cichlid?