Meowzer, I hate to tell you, but everything is with caution, I had a clownfish eat ALL my LPS in my 14G, remember that?
In your size tank and how you feed, most "monitor" fish, such as the foxfaces, would be fine, I'm 99% sure of it. If you back off on feeding, that's when you might see some issues, but even then, it's doubtful.
I'd do a foxface and a Naso. My Blonde Naso is half the size of my Sailfin and she holds her own. The sailfin is definitely top dog, but the naso does just fine. A Purple Tang would be fine as well. I don't think the Vlamingi would hold it's own, they're very peaceful and can often be submissive, especially to a bossy Sailfin and Blue Hippo.
IMO, I would try some smaller fish, some pseudochromis, basslets, etc. I know it says that some fight with each other, but we're not talking about putting these guys in a 30G tank, your tank is huge, you should be fine. Small, colorful fish can really make an aquarium pop.