i am new to hdtv and need some info about set-top-boxes. the TV i'm getting will only have one progressive component input but one of the models i'm looking at will also have a VGA input. I hear that some boxes have VGA output - will this solve that problem? Also, receivers like the DTC-100 that are integrated satellite/OTA HDTV receivers - do i have to activate the card in it? I already have directv with two directivos and won't be buying an elliptical dish anytime soon for just a couple of HD stations. Also, are there really any big differences in these set-top-boxes? the prices all seem to be the same. thanks in advance for this dumb question.