I would take away at least one of those bars... Do you need them all shown? As an Arcane mage, how often do you use Fire Blast? Frostbolt? If you wish to have access to them, you could combine them with another button (but have them on a modifier or right-click).
Buffet can help condense food, potions, mana gems, bandages, and healthstones.
Clique is not just for healers! I use middle-click for Evocation. Shift-right click for poly and decurse. Shift-middle for Slow Fall. etc.
This is just my opinion, of course.
I currently only have 7 buttons showing - all the rest is keybound or bound in Clique.