Go for the regal tang.. I love mine, and i think you would be very pleased with the way it looks in your tank. Just make sure they're just a tad bigger than the clowns so they get minimal aggression but not too big from the rest as you would want them to get some fair share of food when feeding.
Good Luck.. I named mine DORY from the movie finding nemo.
65 Gal Marine
60lbs of LS
and 100lbs of LR
EHEIM 2215 Canister Filter, AquaC Remora Protein Skimmer w preskim box, 36" PFO Lights with 2x 250W 10K MH
and 2x96W T3 Actinics, JBJ Arctica Chiller 1/10 hp w/ Eheim 1250 Pump, Turbo-Twist 3x UV
Sterilizer 9W, (1) Yellow Tang
(1)Potter's Angel, (2) Skunk Cleaner Shrimps,(1) Eibli's Angel, (26) Turbo Snails,(10) Nassarius Snails, (2) Sand sifting starfish
(1) Regal "hippo" Tang, (20) Hermit Crabs, (1) Coral Beauty, (1) Pygmy Angel, (1) Serpent Star, (1) Brittle Star, Pumping Xenia, Finger Leather, Yellow Polyps, Green Star Polyps, Colt Leather, Mushrooms, (2) Maxijet 600 PH
and (2) Maxijet 1200 PH
Am I Overstocked Yet?