Angles are better than squares... ;-)
OK, bad joke.
Before adding a large angel, consider what else you might want to have. Queens and Blue Face angels are much less reef-safe than other angels. Zoanthids, LPS are generally harder to keep with large angels. In my experience, the following large angels are POSSIBLE candidates:
Emperor/Imperator: I have one, loves zoas. Also like clams and some LPS. Leaves palys, SPS and tentacled corals alone
Rock Beauty: my favorite angel. Insanely difficult to get to eat. Eats only sponge in the wild. Will pick on LPS, clams and zoas. Would get another one if my Imperator kicked the bucket.
Bill
215g FOWLR... and anemones, GSP, gorgonians... carp, that isn't FO!
"I killed my first SW Fish in 1971..."