Hay, Im new here. Ive been running in to conflicting info. Im going to upgrade my dish 300 to a dish 500 pro plus, but for now Im keeping my old legacy receivers for now. Some sites say I need a pro adapter others say I dont. Whats up? Also Im thinking of getting a DVR 625, could split the cable coming out to the 2nd tv and have it go to a 3rd.