I hear alot about the sound & vision, and AVIA home theatre tuneup dvd's. First, are they worth anything, second, where can I find them, and third, are they easy to use? I currently have a Sony STRDE545 av reciever, Sony NC655P progressive 5 disc cd/dvd player, and Polk Audio RM6500 speakers. My new toy is arriving on Sat, Mits ws55411, and I want to make sure that I get the most out of it. Email me at [email protected]. Any help would be appreciated.