Personally, I prefer Mantra of Resolve to Mantra of Concentration. The former blocks interrupts constantly at the cost of 4e each (with 8 Inspiration) whereas MoC only blocks one and can't be recast for 20sec.
I'm guessing Power Spike is mostly for interrupting Dying Nightmares. However, I'd recommend using Power Drain instead. It costs 5e vs 10e for Spike, plus you'll get some energy back from it. You can just wand the Nightmares to death after you interrupt their Rend Enchantments. Other than that, I agree with your skill selection.
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