I'm setting up a Sony 30" HD 16x9 set for someone. The HD channels look fabulous, but the non-HD channels look somewhat grainy, and almost blocky or pixelated to a small degree. I split the cable signal, and ran one to the STB for the HD and scambled channels, and the other directly to the antenna input. This improved the picture somewhat, but it still leaves something to be desired. Both the TV and STB have DVI connections. Would the DVI cable make an improvement in this situation for the non-HD channels? Or is it possible that Cablevision is really compressing the heck out of the regular channels to provide the bandwidth necessary for it's HD lineup? I just don't want to spend close to a hundred dollars unless there is a reasonable chance of an improvement. Thanks for any input.