^^^^^^^^^^^ yeah, what they said!
I think most would agree, what ever increase in fuel mileage you get with a CAI tends to be negated by the fact that you'll have your foot into the throttle more heavily because of the awesome sound that you'll get with it.
I have an '08 HEMI with the AEM Brute Force (3rd vehicle I've installed the AEM on) with a stock exhaust (can't make up my mind what I want yet). When I accelerate WOT it sounds a lot like a Flowmaster 40 series, and I really enjoy the dinner plate eyes I get from folks that I'm passing
What is comes down to is how much you're willing to spend, and what you reasonably expect to get out of a CAI