[ericthered]

Using a large, fairly rapidly regenerating Energy Reserve is appropriate for most supermages who use FP-driven systems.

Many times buying the most common abilities as powers and then giving access to a flexible magic system (like RPM, Realm, or the ritual variant of standard magic) is the soundest plan. Sometimes the power stunts system is sufficient to handle the "Flexible Magic". It depends on how much of a workout you'll be giving the flexible system, and how many of the abilities are just the repeatable powers.

I confess I've thought this system through for high-powered mages that act like supers in their settings, not for mages acting in a traditional supers setting.