I believe the best can do it in the pvp blues. I couldn't, I knew I couldn't so I didn't even try.

I followed Kicksome's video guide for farming Totem of the Void and after hitting 70 a couple weeks ago with just 3 pieces of the pvp rep blues I was able to successfully make it in Mech to the chest, I had under 400 spell damage each and had some deaths and wipes along the way but I was impressed at how much abuse the shaman can take especially in the high stam pvp stuff.