Destruction mage at level 22 or so now. Works well so far. I don't need to sneak, I simply blast anything that gets in my way with 2-3 fireballs (dual-wield) and that kills pretty much anything. For things that don't die when I run out of mana, I have a mighty crafted bow + poison. There's very little left in Skyrim that can stand up to me when I'm loaded up with enough magicka potions.
Disadvantage: I have to go without companions - I would blow them up because they're too stupid to hang back when I'm throwing AOE spells around.
