OK, I got the Tempest and in the process of building the enclosure (214L Adire Alignment). Now I need help in picking the amp. I'm not really sure what the major differences are. I do know that the PE has a 30hz bass boost and The AVA has a 25hz bass boost from what I read. Is the $60 dollar price difference worth it on the AVA250. Also, the amps look very similar are they from the same manufacturer? I've also seen the Mods for the PE amp to modify the bass boost, should I keep it stock for my particular enclosure design and application? What do you folks recommend? Should I invest in buying the ports from PE or is PVC piping ok? I'm trying to save some money! Thanks for the help!