I wanted detecting and dispelling magic to be something all casters can do.
I debated on the cantrips, but there were just too few to justify making a separate list. I can see making Detect Magic at will, either at 1st level, or at least by 3rd. Alternately, I could create a really small cantrip list, which wouldn't be bad, but it might look funny only having five or so spells when you get 10-15 first level spells.
Perhaps everyone could get Detect Magic, Detect <element>, Read Magic (?), and Prestidigitation, and then each caster would get:
Pyromancer
Light, Dancing Lights, Daze
Hydromancer
Create Water, Purify Food and Drink, Acid Splash
Geomancer
Resistance, Mending, Virtue
Aeromancer
Mage Hand, Guidance, Ghost Sound