Well,,, like sslarison said,,, Percs are hard to beat for mild temperament and personality,, though I think many tank-raised fish these days look drab and colorless compared to wild caught,, maybe that's just me.
I have a Darwin Oscellaris and a Standard Oscellaris paired up,,, and I have a juvenile pair of Black Percs which are gorgeous.
I've been looking for a nice young pair of Fire Clowns for months but can never seem to find them,, I can't understand why this fish isn't more popular.
I kept an LTA for about a year in a 37g with 110 watts of PC and it seemed to do fine, though it didn't grow much.