I tend to use Striker for PvP and Defender for Strikes/lvl28 story/Raid. Helm of Inmost Light is a great help for Striker providing 2 abilities for Fist of Havoc and Helm of Saint-14 is crucial for Ward of Dawn.. Both have been clutch many times.
I want to get my hands on An Insurmountable Skullfort (ex Titan helm) though at some point!
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I have the An Insurmountable Skullfort. I love it!!!