Race: High Elf hands down for the Max Magicka and damage increase.
Mundus: Thief for increased dps
Skill Rotation: Daedric Curse>light attack>Magicka Detonation>light attack>Force Pulse with light attack weaving. Use Crystal Frag evert time it procs and execute with Mage's Fury.
This can deal a TON of damage! Put all of your points into magicka and get HP to about 17-18K.