Pioneer Elite Pro 1130 plasma

I wanted to know if anyone also had this similar issue. I was interested in buying the plasma elite 1130. The sales person told me that if i installed the monitor more than 9feet away from the Media box than I must buy a longer cable- which is called the Digital connection cable. Only 3 meters come with this unit. This is the only way to hook up the monitor with the media center. In addtion, the sales person told me that (pioneer) does make a 10M which is $600. He further state that this cable is made for pioneer elite plasma and no one makes them. Need help anyone. thanks