Potter's angels are nice looking, remind me of an angel version of the Chevron tang. I saw a Golden Angel awhile back that I loved, but was in the same boat as you worried about it picking on corals. As for other pygmy's, I had an African Flameback Angel that was great and never caused any troubles. Unfortunately they aren't as common now as they were 3 years or so ago when I had mine and they have gone up in price accordingly. Thanks to information in a link Richard posted in another thread about sudden death with some pygmy angels, I have finally been successful at keeping a Flame Angel, which is my all time favorite.