What race should my shaman be in World of Warcraft?

I'm going back to retail in a few weeks here after playing on a vanilla private server and I wanted to start fresh with a shaman. Me and a few buddies are all going to play together and I wanted to go with a shaman, we're going horde by the way. I've been stuck between Orc, Troll, and Tauren. Goblin isn't a option, I hate the way gear looks on them. I want something that looks good in armor endgame/leveling in general, and decent racials (doesn't need to be perfect) Also, a few pointers, I want to chose a good pvp class and not sure what to pick, elemental or enhancement. One more thing, my friend said in enhancement there is a talent that allows you to cast and move at the same time without interruption, if that's true does it include healing spells? Thank you.