we can give you some ideas, but without knowing how longthe cables need to be, it's going to be up to you to improvise a little:
DVD to TV- I would recommend you use an HDMI to HDMI. You have the connections on both ends, and something like this would work pretty well:
http://www.thetwistergroup.com/product/516-810BK D23463.html
or, a little better,
http://www.thetwistergroup.com/product/AP-085 D21454.html
You would also need a fiber optic (or "Toslink") cable to get sound to your receiver (see
http://www.thetwistergroup.com/product/AP-081 D00040.html )
PLEASE NOTE: You didn't give a model number on the dish box, so I'm guessing it has a DVI jack, but not an HDMI jack. If the dish box has an HDMI jack, use the HDMI for the dish box.
Dish to TV- I would recommend you use the DVI on the box to the DVI on the TV.
http://www.thetwistergroup.com/product/506-960 D13965.html
you'll also need an optic cable (if the box has a jack) or a decent set of RCA cables to get the sound from the cable box to the receiver, and then a second set to go from the receiver to the TV.
two sets of these should do the trick if there is no optic cable jack
http://www.thetwistergroup.com/product/RS2-320 D26724.html
this will get you the most simple set-up, where all the video goes to video and all the audio to the receiver. if you want to do your switching through the receiver, it would be more complicated, and I don't think an 801 has HDMI or DVI connections, so you would be wasting your best possible picture.
good luck. by the way, I don't work for the twister group, you can get similar products at parts express, accessories4less, and in many cases, decent stuff from your local Walmart and Lowe's without resorting to the M word.