You will be glad you took the clown tang back. I have had every fish in your "want to add list" This is based on my personal experience.
royal gamma- pretty fish will pick a small territory and guard with his life.
Yellow watchman- also pretty but will stay in the rocks a lot.
flame hawkfish- one of my favorite fish. I sold him because I had many shrimp and he tried to eat them. He was not large enough but was growing. If you have shrimp stay away otherwise a definite buy.
I would pick the convict over the yellow. Mine has the best personality in the tank. Also everyone has yellow tangs...something different.
Dwarf angel I would pick coral beauty. Flame have rep of being captured using cyanide. Be aware they are have a 50-50 chance of being coral nippers. Mine has been fine for around 6 months. (crosses fingers) see avatar