I currently have a 3x4 multiswitch feeding two standalone receivers and one DVR- so all 4 ports are used. I want to add another DVR and in fact picked up two used R10 units last night. I don't anticipate moving to high def anytime soon as I am putting up an OTA antenna for Hi Def locals. I don't want to get into diplexers since I am only running high def to 1 tv and a dedicated new run is no problem at all. Am I correct in that I have to upgrade my existing 3x4 multiswitch to a 3x8 multiswitch? Is there another simpler (Cheaper?) way? If the 3x8 is the answer- any recommendations for brands or source? Thanks!