Thief. I played a mage but the lack of magicka regeneration in combat made it mind numbingly dull. Played a warrior but found that I killed the majority of enemies using my bow and rarely used my axe so I just went full blown stealth instead.
I play a stealth character, but only use the Thief stone when I'm leveling Alchemy is it levels so slowly otherwise. I think next I'll play as a mage and probably choose one of the morrowind style birthsigns instead of the Mage.
Specialise in archery and destruction but willing to raise staff and sword as needed. About to do Mage School and DB quest lines before heading back to the MQ