Good one handed weapon for mages?

[Pocus]

I know its not a hand slot, but foremost you should add reinvigoration items: girdle of might (reinving 3), boots of messenger (reinving 4) and then rainbow armor (some protection and reinvig too).

Then I bet you will too busy to even think of the hand slot.

Otherwise Zen items are good choice. I would add the firebrand, for the increased fire protection, but only if you are suspicious that the enemy can cast fire from afars or flames from the skies. The extra 50 fire resistance will make the difference between having his mages roasted and having 80% surviving.