I am not sold on the whole +15 NR. Wind Shock and Roots, I can see why you'd need it VS. these, even then it is a slim chance I'd assume being only 15 and you aren't grabbing NR anywhere else.
Purge, I've been playing a Shaman a LONG ASS time, I spam the shit out of Purge until you have NO buffs left. Purge isn't something I hit once and go 'OHNOEZ RESIST!1' and go back to pounding on you, I break my = key (always my key for Purge) making sure you are unbuffed. Hell, I'll hit it so much I get spammed with the 'Nothing to dispel' message.
Just saying. I can see why with Roots and Wind Shock, but Purge? Really? It's like the same logic with casting some random buff on yourself so I can't Purge your AGM bubble. Purge is random, so I might go right by your random crap buff and hit your AGM bubble, I may not, either way I am breaking my = key until I see the 'Nothing to dispel' message fill my screen.
~Zuty