Power Words from the Magus (C3) (the same reasons as munchy)
Lores Master from the Sage (C2). (Besides having some good spells for players with a less-than-perfect memory, it also have two constant and free spells that gives +20 reasoning and +20 memory)
Combat Enhancement from the WarriorMage (C2)
OR The Fist from WitchHunter (C7) (In a perfect world, Archmages dont have to enter melee.. but with a GM, it's rarely a perfect world
)
Wizard Staff from the Wizard (C5),
Druid Staff from the Druid (C1)
OR WarriorBlade from ArmsMaster (C7). The choise depend on the GM and the weapon. If you use a QStaff, take Wizard Staff IF the GM allows the Adder to work for Arcane spells and not just Essence spells. If not, take the druid staff, which have no such restrictions. If you use a blade, then WarriorBlade is very good.
Spirit Runes from Magus (C3). (It's always nice to be able to help the party with making magical weapons on the road)
Words of Power from RuneMaster (C2). (Versatile AND instantatious)
The greatest problem is as always that without knowing the style of play and the campaign, it's hard to say what lists would be best