Dwarf Angel or Tang

I have a FOWLR 50 gallon tank. I plan on eventually adding coral. I have about 50lbs of LR so there is lots of open space. I'm looking to add my last fish. I want something larger and colorful so probably a dwarf angel or tang. The fire dwarf angel looks cool... These are the fish I currently have in the tank:
2 orange clowns
1 6 stripped wrasse
2 bangai cardinals
1 sand sifting dragon gobi
1 coral banded shrimp
blue hermits and margarita snails.

I am only adding 1 more fish so what would you recommend? This fish will be the "centerpiece" so should be colorful.
Thanks!