I'm only going for 5/8 and even that is stretching it on resto sham. You really only care about 3/8 T2, which you get like your first BWL run if you're lucky. I'm an mp5/spirit healer, every piece I have either has mp5 or spirit, so I care more about 5 piece bonus than I do healing power.
Really you want T1 just to stop looking ugly lol. Earthfury is one of the best looking sets ever created for shamans imo.