That's a lot of fish to stock in a 60 or an 80 gallon, IMO. I only have 2 tangs in my 55, and one (a sailfin) has grown so quickly over the last 2 years that I'm afraid I'll have to find it a new home in another year or two.
Also consider what else you're planning on putting in the tank. LR takes up a good deal of space, for example, and you're going to need something like that to build hiding places for these fish. Many need a territory they can call their own, particularly when sleeping.