I don't have many options for good Sunsinger exotics unless i use gauntlets, but i really wanted to rock the IB gauntlets. Otherwise Ahamkara's claws and sunbreakers are pretty good.
-I can't get Praxic Fire
-Starfire is pretty useless.
-I have worn Voidfang vestments to death and they are intended to be used with voidwalkers, even though it works just fine for PVP sunsingers.
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Apotheosis veil, since it is sub-class neutral. It will come with discipline, so if you like throwing grenades, youre gonna have a fun time, and its special perk comes in handy in a pinch.