1 - You should have an HDTV. You can still enjoy watching it on a standard tv set but I am sure there will be a black division on the top and bottom of your tv.
2 - an HD receiver is a must to receive HD programs. Examples of these are the ViP211, ViP222, ViP622, and the ViP722
3 - Add a high definition premium channels to your package for only $10
Keep in mind that whenever you are adding upgrades on your package, the amount of it will always go up depending on the package you ordered.