My home theater is pretty basic at this point so I'd answer no to most of your questions. My system currently is a Hush Media Center hooked into my old receiver through a series of noisy connections and then into my TV. I'd like to upgrade the receiver and then the TV to a HD TV but don't want the receiver to be a bottleneck in a year or two. Room correction? yes, USB? probably...ipod? not necessary...XM radio? at some point...SACD/DVD not needed. My biggest concern is trying to buy something that isn't obsolete by the time it's delivered because I've picked the wrong standard. Thanks for the questions though. It's clear I need to do some more reading.