I am trying to see which would be the best route to take. I currently have Directv with a DVR Plus receiver. I have no HD tv's. I would like to be able to get the Directv on Demand channels. With that you need a HD receiver or you can use the R22 receiver. I hate to have to pay the monthly fee for the HD services since I won't be able to take advantage of HD tv.. Is there much difference between the R22 and a Hd 21 receiver.