Most powerful WOW character/class for solo-play?

[Rinnhart]

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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As in Diablo2, all character classes can solo. Which is best is a matter of opinion and style (I can't solo a spellcaster to save my life).

Race matters little. Play what you like.

You pay for an account. You can have as many accounts as you like so long as you're willing to shell out the cash. I don't know how many characters you can have per account, though usually you can have only so many chacters per server.