I currently have the vip722 receiver hooked up to a HD television in living room. I currently have a standard definition hooked up to TV 2 location. I am thinking about buying a HD ready television to replace the TV 2. When I get the TV and eventually want to upgrad to HD programming for that TV. I know I need to get a 2nd HD receiver for that television from Dish network. My question is. Can I keep the vip722 receiver hooked up to TV 1. Do I need the 2nd receiver be a DVR also so I can continue to be able to watch 1 show while I record another.