I have not subscribed to Sky for about 5 or 6 years now, but I have just purchased a Panasonic TH42PZ85B. To get Sky HD installed it is going to cost me well over £350 to get Sky HD installed. As I still have my existing Sky Satellite Dish on the roof of my house, would it be better to purchase a Sky Box on Ebay as they appear to be much cheaper, or do I need a new dish to receive Sky HD