I have an HDTV that has HDMI INPUT and also has an digital audio OUT via TOSLINK. I have an HT receiver with digital audio IN but no HDMI inputs. Is the correct setup to run HDMI from a ROKU to the HDTV and then fiber from the HDTV to the HT receiver and, if so, is there actually any 5.1 dolby material available from the Roku channels? Given this setup, is there any reason to select the XD/S over the less expensive XD Roku - I am not interested in the USB port. Thanks so much.