The best one I've seen out there is the LMI True CAI which is a fenderpull CAI. As said above, the air filter is located down in the fenderwell area, far away from engine bay heat and near cool air sources. The downside is it requires some slight modification to mount it and then changing/cleaning the air filter requires you to remove the front two belly pans. Not sure how it'd work out if you went through some deep water either if you got stuck in a bad storm. I think those were dyno'd to put out about 10-12 hp over stock on the LX forums. Those are your best bet in terms of performance. I think that one runs around $400.
Otherwise all of the "short ram" intakes like Airaid, Mopar, K&N, etc are more for looks and sound and offer only minimal performance gains around 5-8hp. The Mopar one is definitely sharp looking, but it's kind of pricey too. Just depends on your budget and what you're looking for.