Do not forget that Sorcerer/Mages have a lot of useful protective spells. While that solo Barbarian is screaming as he triggers an Imprisonment trap, and that solo Archer yelps as the spike trap goes up his a**, the Sorcerer/Mage is prancing around with Stoneskins, Mirror Images, Spell Immunities, etc... ...
Knock handles locks.
You can find my personal spell list from the links in my signature.