I just LOVE tangs! I have the following in my 500 gallon...Black Tang, Achilles Tang, Orange Shoulder Tang, Chevron Tang, Hawaiian Naso Tang with streamers, Maculiceps and the Fowleri Tang.
My top 3 would be...
AUSTRALIAN Dussumieri (not the Hawaiian version)
Achilles Tang
Orange Shoulder-Adult (the most under rated tang imo)