If I have a composite signal video VCR, a S-Video signal digital cable box and a progressive Scan Component video signal from a Dvd player, are there any receivers that will accept these and do what ever conversion and switching necessary to allow only 1 component video connection to my HD-Ready TV?

Even if it would, could the TV handle switching between high definition (progressive DVD) and non high definition (VCR and Cable) sources on the one input?