I've been researching the same thing as I love triggers, too. From what I've read, only the Xanthichthys genus is safe (generally). That would be the Blue Throat, Sargassum or Crosshatch.

Some have reported sucess with Niger and Pink Tails, but it seems that it may not be a question of "if" they will eat something they shouldn't, but when...

That being said, I am hoping to add a Blue Throat to my reef this week