I have 3 shamans. Orc, Tauren and Troll. While arguments could be made for Dwarves, I think those 3 horde races embody the "tribal" shaman feel.
I only have the MoP gold set on my Orc, but I also want it on my Troll and Tauren. Unfortunately, there can only be one. What race do you think that set looks the best on?