I'm playing a Barbarian 1/Inquisitor 5 right now. It's my first time playing the Inquisitor class and I'm really enjoying it. The firt Barb level I took at creation for RP reasons, I'm about to level up and I can't decide if I want a second level of Barb. I'm mostly interested in the Moment of Clarity power, though d12 HD, +1 Fort, +1 Bab, +2 rounds of rage, and uncanny dodge are all nice.
The only problem is I'd be losing yet another caster level. Is it really worth it to be able to cast while raging?
From purely optimization view, definitely not worth it. From a RP view moment of clarity could make sense and the other stuff you with helps.