Quote Originally Posted by Witty Username View Post
The one I have heard is tempest cleric + scribe wizard.
Scribe wizard allows for improved spell selection since lightning spells tend to be a bit lackluster.

Maximized Cone of Lightning or Lightning ball is where you want to be.
Cone of Cold and Fireball are both on the Sorc spell list. The only (admittedly quite large) advantage of the Scribe wizard is being able to change the damage type without the SP cost. If one is looking for thematic consistency in addition to mechanical power, they're not that far behind.