I am a long time Dishnetwork customer with a Dish 500 dish (looking at 110 and 119 AT250), and two receivers (3900 and 4900). I want to upgrade to HD. I would like to end up with a VIP722 on my main HDTV, and the old 4900 on my old SDTV (the 3900 would no longer be used).
My questions are...