I just posted my very first Arcane bachground, take a look!
I figured I could balance the different kinds of mages by limiting the powers they can do. I gave them less power points to force them to start using the "weak version" of the different powers, then they can upgrade. They get more starting spells because I want to make every element (trapping) a separate spell. To compensate for these inconveniences I gave them no penalty for rolling ones.
What do you think?