I presently have a 625 & 4900 with a Dish 500 system (located south of Louisville, KY). I am considering upgrading to the 722, but I still want to keep the 4900 operational. Later down the road if I want to add a 2nd dual tuner receiver, which dish should I have. I would like to make sure that the dish is somewhat "future" proof. If I decide to replace the 4900 with my present 625, will the dvr fee apply to both the 722 & 625?