With a mage consider developping Hellspikes for later - it has the advantage of not being hindered by resistance levels to fire, lightning, poison or spiritual!
If you don't want your wizard to carry heavy armor then the shield spells are worthwile.
Other classes' skills beside lockpick and repair? Pickpocket 1-2 levels; elven sight for rapid map exploration; wisdom for experience boost; deadly gift; and, if your in the mood for gambling for luck: heavenly present; ...
