Contemplating 2nd Dragon Age 2 playthrough. Interesting talent trees?

I played as a warrior my first time through. I might just play as a mage 2nd time through.

I'm thinking I might as well do a blood mage, though it'll take time to come up. Wonder what trees work well with it. Spirit? Elemental?

Mage is the most over powered class in that game. I liked the gameplay and battle system in DA2, but story was just flat out ridiculous.

Level the stone armor and the spell that rains fire from above all the way up asap, and you will be unstoppable.