I have done a lot of research on triggers because i really want to put one in my tank when everything is ready. This includes book and online research and asking lots of questions at my LFS, employees of which are very knowledgable.(all have to pass the M-1 certification test before handling costumers)
From my research i have decided that Riggens Trigger, Pink Tail Trigger, Blue Throat Trigger, and Crosshatch trigger can all be kept with not only smaller fish, but in a reef tank with limited to no damage.