This is only theorycrafting but anyway;
OK so lets get serious here, rods are pretty underwhelming compared to guns. Their single target damage isn't that great and even though Blast can penetrate DR, its damage is not as impressive as Carnage or any of your AoE spells or any other AoE something.
So yes, I'm thinking, Wizard with a Gun.
I mean lets get serious, in one hand a blunderbuss, in another a grimoire. Badass, am i rite? Since Guns do way more damage than sissy wands, it'll probably help the Wizard's damage output somewhat.
Well the other thing is, that also frees up 2 talent slots, which can probably go into much more useful talents like Scion of Flame or Marksman. Any thoughts though?