Most powerful WOW character/class for solo-play?

[Treesh]

I think it will be the Orc or Tauren "Shaman" for occasional WOW solo-gaming for both outdoor farming and instance farming. Does anyone have any arguments, or a beta-report, that could prevent me from playing a "Shaman"? :) How well is the "Shaman" class currently balanced, and does it make a difference which race you pick for the "Shaman": Orc, Tauren or Troll?
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FWIW, I absolutely loved playing my Tauren Shaman. The reason I picked Tauren over the others was that I liked the grasslands of the Taurens much better than the nasty red, desert-like scenery of the Orcs and Trolls. The quest for the fire totem for my Tauren Shaman was rather annoying due to poor directions in the quest log, but that was the only thing I really disliked with my shaman. It's a very well-rounded class and once you learn how to control the amount of aggro you create, they're quite easy to play.