Shapechange (swiss-army-knife of utility; notable uses include turning into a flying critter, turning into something small to get in and out of places, turning into a "human" (you can't do metahumans, but you can do humans) for a disguise. Check how your GM rules the Body restriction ("Between Body-2 and Body+2" is common but not universal) and make sure you can actually turn into useful stuff.
Metal Wall (opaque, solid walls are obviously useful)
Stunbolt (every mage should know this)
Stunball (take out large groups for low drain and nonlethal)
I considered shapechange, but with 5 body.. I can't really turn into the useful stuff. It's not high enough to get the heavy duty animals, and it's too high to turn into any of the flying creatures or smaller/sneakier stuff. Here's a list of the possibilities for my 5 body(giving me animals from 3 to 7 body):
In water: giant squid(octopus), seal(sea lion), hammerhead shark(great white), sturgeon(manta ray)
On Land: alligator, alligator turtle(alligator), boar, cheetah, hyena(african wild dog), antelope, okapi(zebra), burro(camel), baboon, gibbon, gorilla, domestic pig, ostrich, bobcat, wolverine, phython, boa constrictor(python)
Do you need both stunbolt and stunball? I was going to just take stunball, as a group spell would still work on an individual.
p.s. - I'm a huge fan of your magicians. The fluff alone makes them worthwhile reads.