The best price I found for my smooth tubes was from partsrack. Also, excellent service and friendly staff (and that was even before Jon B was hired!). As far as Hennesey's tubes being the "best," I wouldn't sweat that, as long as the tube is rigid enough not to "taco" under pressure, and is in fact "smooth" to give a less obtrusive airflow (both of which partsrack's tubes have shown to be on my car), they should be fine. Also, remember that you will likely pay for the name associated with certain tuner's parts or even genuine "Mopar" parts (last I checked Dodge wanted close to $200 for tubes and filters).
As far as smacking Hennesey, better watch out, or John himself may come back with one of his epic "internet whiners" slams! Bring it!
WAR TUNAS, ERRRR TUNERS!