Both of the new dish network hd receivers have hdmi inputs. You could go with an hdmi connection on that and the if the dvd player is an upconverting player (720p, 1080i) you can also use hdmi on that. If its just a plain progressive scan dvd player you'll need to use component cables.
I would also recommend some sort of calibration disk to help you adjust the colors on the tv. Something like avia or digital video essentials.