I would add the clowns last,they are the bastard child of damsels.
I always recommend a reef safe wrasse.One of the fairy or flasher wrasses are nice.Carpenter,McCosker's,Filamented flasher wrasse or Longfin,Scott's fairy wrasses.
There are too many flasher and fairy wrasse to list.Most,if all are pretty peaceful,colorful and easy to care for.Watch out though,they like to jump.