Looking for suggestions on tangs...

[Rice Reef]

I am considering adding one more tang to my intended sps dominant reef tank but not certain what tang would be best for my tank... I had planned to pick up a Kole Tang today but was then informed that they will show a lot of aggression towards blennys. I am looking for a tang that is not selective when comes to grazing on algae but is also not aggressive to other algae grazing fish. Any suggestions? I current have a regal and a yellow tang and I also have a big and fat lawnmower blenny with full of personality. I would hate to lose this fella but having just one more tang that enjoys doing some housekeeping in the tank would be great too!

Thanks!!!