If I have a Toshiba 50HX70 with a Model 6000 satellite receiver. My question is: would getting an external line doubler (dvdo iscan pro) help clean up regular satellite channels? I know the TV is HDTV and has a built in line doubler for NTSC signal, but will converting this Satellite signal (NTSC) into 480p help clear up the picture even more. Or is the line doubler built into the tv good enough? Is 1080i better than 480p? The TV works great in HDTV mode and the picture is amazing, just wish they would have more than 3 channels here in Canada. HDTV broadcasts are awesome. Just want to clean up the other 200 channels that are not broadcast in hdtv. I dont know if the regular satellite channels can be cleaned up anymore. It may be the source/channel. Maybe I have been spoiled with the new hdtv receiver and now can see how clear these hdtv broadcasts are and want that for the rest of the channels Thanks in Advance.