You're short some defense, which is fine for the shadow meld build assuming you are willing to wait for that power's activation time. Seems close enough, given how relatively cheap it would be. I would take waterspout over spirit shark if you could, it's just a great power to cast and let fly for both single target and aoe. Also, Permafrost is the most skip-able power in /ice if you want another power choice for something else.