I would personally feel that the best choice is a Kole (aka Yellow eye tang) for long term. IMO, NO other tang is suitable as a long term inhabitant of a 75g. Mulitple tangs can be a signficiant issue due to territoriality.
However, you will certainly hear from many who say they do and everything is fine. However, it is important to note that you should be making judgements on fish that actually been in the tank for years, not months. And, IMO, nearly all tangs should...if "fine"...outgrow this size tank.