I currently have one vip622 running a hd tv and a sd tv, I'm wanting to add another hd tv, the sd tv isn't used a lot but I want to keep it. My question is, would the subscription be cheaper to change to a hopper system for the two hd tv's and sd tv or just get another vip receiver for the new hd tv? I've tried to look on dish's site but can't find the info and the telephone support wasn't much better.