Medium vs Light is just Mitigation difference. At 50 I can solo ^^ blue mobs because HH + Ward + VLA in battle mana regen items (RoI and GEB) + Mana Stone = Death to blue. Mitigation is overated when soloing for shaman because we don't need to mitigate anything. The more we avoide the better, but with a ward up not taking mitigation into account why care what armor you have? It's all about power pool to keep that ward up and the slow on. As far as group goes, Don't get hit

. Level 50+ Raid mobs drop some good medium drops with +15 Wis and 40+ power on them. The enchanged ebon gloves etc are close the the crafted ebon. So, just wear whatever. It doesn't really matter in the end, and all the chain looks horrid at T5 anyway.