Since your TV only has S-video, you can safely ignore the component video jacks. Make sure you connect the Sanyo's digital coax output to one of the two digital coax inputs on your receiver (located on the bottom left if looking directly at the back of the unit). That will give you sound for DVDs. Then for CD/MP3 audio, connect a stero-pair of RCA cables from the Sanyo to the CD inputs on the back of the Denon.
Also, connect the s-video from the DVD player to the S-video DVD in on your receiver. Do the same for the Dish receiver, except plug it into the DBS s-video slot. Then connect the S-video monitor out from the receiver to the S-video in on the TV. That should do it. Pages 7 - 9 of the Denon manual show detailed pics of the above process.
