It depends,
If you are into spells & magics, choose
Druid - nature & shapeshifting spells
Shaman - healing & shamanistic spells
Warlock - demonic spells
Mage - ice & fire spells
Priest - holy & healing spells
If you are into melee attacks, choose
Warrior - the most normal of them all
Death Knight - the darker equivalent of the paladins
Paladin - the melee fighters of light
If you are into range attacks, choose
Rogue - poison, stealth, and a good combination of melee & range
Hunter - animal taming & range attacks
In my opinion, I would choose a druid & rogue because they represent my inner self.
That's all :) xxxXBAITAXxxx