Another tang stocking thread

[Albertan22]

I'm pondering between a Kole Tang, a Purple Tang, a Powder Brown Tang or a Powder Blue Tang for my 120g LPS/SPS reef. I had always initially planned on putting a Kole Tang in the tank because it's only a 4' tank, but lately I've been second thoughts. I think I'm ready to add a tang and need to make a decision. Anybody have any advice on choosing between these 4 fish?

My current stocking list includes: (1) foxface, (2) ocellaris clowns, (4) blue green chromis, (1) yellow watchman goby, (1) midas blenny, (1) purple firefish and (1) mandarin dragonet.