Golden dwarf is your best bet.
Like ivgonmad said, all eels are technically reef safe in that they won't bother corals, but inverts and fish (depending on the species) are fair game. One thing with eels like snowflakes and zebras in reefs is that they can have a tendency to knock over corals, or get them covered in sand while burrowing. Make sure your corals are securely attatched to rock...I'd say that golden dwarfs and zebras are really the two best for reef tanks.