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Tauren: I wouldn't. Their HP buff is getting a slight nurf, and they have a larger hitbox. As a multiboxing shaman team that will work against you. Also you may never use their stomp once you get Thunderstorm.
Troll: Best for 5 man instances/raids. Their haste racial will help you take down those bosses without hurting your healing if needed.
Orc: Best for PvP. Before the change to sturdiness they were the best PvP race by far. I still think they hold that title, but its a lot closer now. They should still have the best burst DPS with the extra spell power.
Jungle Fever: Why not try something new and different? Use mixed races/sex and balance their differences! 2 orcs, 2 troll, 1 tauren.
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you know I didnt even think of mixing up troll and orc, bah!
edit: Just so people know how significant this choice is, I have 4 male orcs and one female. The female always gets stuck on world geometry and for some VERY strange reason, body aggro is always on her first. Very weird but I can reproduce it. It's like she has a larger aggro radius(same level).