Obviously any of the angels (genicanthus being the exception) pose some risk in a reef tank. Most of the pygmy angels are a relatively safe choice, with some being better than others. A few dwarf angels that some to mind are the Potters, Flame, Flame Back, Fishers, Cherub, Rusty, and Joculator and a few others.
For large angels it can really be hit and miss. For the most part many of the large angels are fine with SPS corals. It is the LPS and Zoanthus that are in the greatest danger. But a few large angels that I would have no issues with adding to my reef tank are the Regal, Majestic, Blueface, Blue Line, Goldflake, Conspic, Bandit, Bluespot, Griffis and a few others. Again remember that any fish can take a liking to corals, and there are many factors that determine whether or not a fish will eat corals.
~Michael