I now have a 301 and an older superdish(in KY). I also have a contract without HD. I want to purchase a dual tuner dvr but don't know what to get. I recently acquired a dish 500 dish with dpp lnb. Should I install this dish before I get another receiver or will superdish be OK? Also, I don't understand about MPEG and NON MPEG. Can you explain?