I have Dish Network and I have HD Channels. I have an HD 1080P LCD Sansui TV. The TV is absolutely amazing I love it. But the picture looks kind of bad with Dish Network. Like the picture doesn't look it's best, and like the words on the Guide look bad. There isn't a receiver right by the TV, it runs through the Air off my receiver upstairs. (It's a 722K HD Receiver) So yeah my TV down stairs runs off that receiver. In the back of the TV there is 3 cords right next to eachother that say S Video, does that have to do with my Dish Setup? How can I get my picture to look it's best? I need a good detailed guide please please please! 
Thanks.
Thanks.