Unless you were lucky enough to get your "optimal" or "desired" build, meaning you have the right amount of Intellect, Discipline, and Strength for your character then you have no reason to waste your shards yet seeing as there is no reason be 32.
[spoiler]32's are dumb...[/spoiler]
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I actually like my 32 build. And the reason my helm isn't upgraded is bc I don't like the stats.. More importantly, reaching 32 gets you prepared for hard raid. First, you make a build that works. Then you start to optimize!