Agreed, it just depends on what type of tank you want. A "full reef" (
), blenny's are up there. But hands down, I think large puffers take the cake as far as interactions with people. The way they beg, splash, and split at you
Triggers are very 'social' with other fish in the tank. They love structure, and perhaps some of them are a bit bossy. They love playing with things in the tank, and playing in the waves.