I think mages should have thematic utility powers. Unknown Armies is a great example:

-Avatars require no mojo for their powers, but are severely limited, to self-buffs of one form to another for most, with the most extravagant getting slight form changes (or party buffs for the MVP).
-Adepts have broader powers than Avatars, still in a theme, and generally their powers affect the real world in some way (but not always, see Bibliomancers and Cliomancers). They do, however, require mojo in the form of charges.
-Thaumaturgists have theoretical access to a lot of spells, but they take time to cast and are generally more indirect than Adepts. They only require mojo for big spells, in the form of Significant (or Major) charges.

The nice thing is, as magic sucks up a lot of skill points, mundanes are generally more versatile or more effective, especially if they go for combat.