Well, seeing as I'm playing RHoD . . .
a sorcerer, with fireball and dispel magic. Those two spells will save your party's butt. I dunno, maybe it's just my GM who wants to always have dragons cast mage armor and shield as their first two actions in a fight, but hitting AC 32 is pretty bleeping hard at 9th level. Plus, you're fighting an army. Refusing to take fireball is tantamount to a sin.
Cross-class ranks into use magic device, so with a decent Charisma you should be able to take 10 out of combat with cure wands. I promise you, if you're killing the bad guys fast enough before they can drink their healing potions, you'll never want for healing supplies.
Actually, if you're 7th level? Dragon shaman 1/sorcerer 6. Get fireball first.