I like it, but personally I don't think I could go without my shatter. Also with my Bad Juju and Obsidian Mind combo, nothing else really matters for dealing out space magic. Also I grab energy and armour over agility any day (I solo alot.)
Just my opinion though. This still sounds like a solid build.
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My thought behind preferring Agility over armor is the ability to escape and recover over being able to take more punishment. Also, good recovery (seems?) To assist the Life Steal affect.