I had a 12" volitian at one time...I loved that fish, he got me once tho. Nothing like getting stung by your pet But id have to say that my favorite would be the Bamboo Catshark, flowed closely by the panther grouper
In my old tank I had an emperor angle. It was around 8 inches long and was just starting to change to adult coloration. It was awsome. I sold it when my tank crashed. I am glad it survived it. I had a lot of great fish though including my Naso tang all beautiful.