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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I use light beyond nemesis for Sunsinger and obisidan mind for void walker. It works out pretty well, sunsinger for support and void walker for wreaking havoc.