Just borrowed a copy of Gurps magic from a friend and it seems incredibly easy to adapt to BRP. They use power points which translates directly to mp. Each spell is a skill, but I guess you could use school skills as well. They use a kind of curriculum approach, the mage have to know the prerequisite spells before being able to learn a spell. For example fireball requires that the mage knows create fire and shape fire.
I know this might not be everyone's cup-of-tea but some people might find it a useful alternative to the existing RQ (III) systems and the "new" BRP systems. An added bonus is that the book is available as a PDF, from which one can copy and paste as much as one pleases... I'm seriously considering adding this to my collection.
There's a fan created list of all spells, with just the basic data at:
GURPS Resources