I am with evil's on zebra moray, panther grouper, porcupine puffer, either dragon or lunare wrasses, I think an angler would be cool as well, very different. I like the zebra over the dragon though, less expensive and not as much risk I believe. plus the zebra and panther would lower the fish cost- instead of the golden puffer, emperor angel, and dragon moray. Could you imagine just loosing the last three if the tank were to crash?
I am asking the same question with a 90 gallon and looking at some of the same fish.