I just ran a 50 foot HDMI cable from a D* HDTIVO to a Toshiba display with no issues using Key Digital Cobra HDMI cable.

If you are going to connect multiple devices to a single HDMI input you will need to use a HDMI switcher. These will need to have a built in scaler which will manage the EDID and HDCP between devices and display. I do have a HDMI switcher in the lab for which I am writing a module but, alas, I have just one digital device, an old Sony HD-200 which has a DVI connector. Neither the Integra DVD players nor the Sony 777ES have HDMI connections.

Alan