I have a small huma huma trigger in my 55, but i'm getting close to getting rid of it, not because of size, as it has barely grown an inch since i've gotten it 6 months ago, but because i want to get some more docile fish that I don't want to have to worry about him beating up.
MY personal view is, if you're planning an aggressive tank with no inverts, you may be able to pull off a huma huma or bluethroat.