Most powerful WOW character/class for solo-play?

[Jini]

Now that the game is going final, and a lot things have been changed and rebalanced, here's again a question I've been asking about a half year ago:

What is the most powerful character/class if you intend to play WOW just occasionally and mostly solo? Is, for example, the melee-centered Orc Warrior ín WOW the same power-house as the Barbarian is in Dibalo II, who was perfect for solo-games? Or should one better choose a Mage, Druid, Shaman or Warlock? Or a Hunter?

And another question:

It has been mentioned that WOW players are allowed to create up to 50 different characters. Are all these characters possible only under one account name, or can you create multiple accounts as in the Diablo II Battle.net?
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Shaman make a great soloing class as they can do nearly everything only slightly less effectively than the other classes which specialze in the various areas. Mages have been known to have very high XP/hour rates.

Each account may have up to 50 characters with 10 per server max. You can have one account per game key.