For the Striker side of things I suggest Helm of Inmost Light, it grants you the [i]Death from Above[/i] and [i]Headstrong[/i] skills, allowing more flexibility in your Striker Build. Defender side, you have Helm of Saint-14, which grants you the ability to blind anyone who dares enter your Disco-Bubble!
If your looking for a Class Neutral armor, Ruin Wings, The Armamentarium, and Crest of Alpha Lupi are great and lend well towards support roles.
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the crest isn't as useful in hard mode though