I played the role of the bugger, and voted "other" on everything.
That is because I feel magic should be accessible through several methods.
The priest - through rituals to channel your soul's power, and higher powers. Basically you pray a lot. - Spells per day
The monk - through mediation, vows, and movement to focus your chi you can work magic. - Basically you do Ti Chi for magic. System like Diablo III where you build up Chi and spend it, though there should be non-combat ways to build Chi
The wizard - through studying the magic that came before, you learn arcane rituals to work magic. Read book, follow book, mix things up and hope it does not go boom. - Spells per day, and a mix an match effects system.
The sourcer/natural mage - through intuition you learn to cast a few spells. - Advantages could be more spells per day, a manta pool that regenerates over time vs. spells per day, or fewer more powerful spells per day - Disadvantages would be the lack of ability to learn more ritual spells
The alchemist - it's all Science!!! A la Sons of Ether from White Wolf. - Powers fueled by materials and the time it takes to mix them.