Well, the sailfin will eventually outgrow the tank. They get huge. That would be my only concern with another tang. If this was my tank, I would aim for one of the smaller tangs for in the system in an attempt to off set that. So like a kole tang. When it comes to tangs, you want to try to have different looking ones to avoid aggression between them.
As for any different fish, you mentioned wrasses. Is this a FOWLR system or a reef setup in the making? That will make many choices easier when it comes to wrasses.
If this was me looking for new fish, I would love to have a much larger tank so I could have a small school of anthias. This might be something you would enjoy having if you look into it. I'm personally a fan of the sunset anthias and a 125 is perfect for a small school of them as long as the lbs per gallon rule for live rock is being followed.