Well, after looking at the mods Thrasher suggested, I ended up back at a human cleric, with storm and earth domains. This will be an offensive caster, thanks to call lightning, ice storm, and chain lightning. I can also do melee thanks to earth, which grants the toughness feat and stoneskin. I also took intuitive attack from Kaedrin's PrC pack which gives a bonus to attack with weapons.

If this was my first playthrough, I would never use the mods, but since this is number 3, I thought it'd be fun and overpowering. I'm playing on hard, so the fire domain with fireball would be tough to do with collateral damage.