I just got a widescreen LCD tv that has a built in HDTV tuner, I am using a 121 superdish 522 (2)510's 501, this fall (September ish) I would like to subscribe to HDTV programming, does all the HD programming use the 61.5? I am confused about this MPEG 4 deal, should I wait untill it comes out before I go to HD or doesn't it matter, what about HD receivers for current subs? I own all my equipment and would like to own a HD receiver if possible. Thanks for any advice or thoughts.