I had a coral beauty and a flame angel in a 115 that got along ok until the flame went carpet surfing.
I'm going to be setting up a 180 within the month and I plan on having the coral beauty, a flame, and one other centropyge (possibly a lemonpeel). the coral beauties are extremely peaceful from my experience. the flame was a little more boisterous, but not too much.
I think the key is to get angels that are very different colors from each other, try to put them in at the same time or the more peaceful ones first, and try to make sure they're around the same size.