I had my HD DVR installed today; when the installer unboxed the receivers I noticed they were HR-20’s. I asked him about the HR-20’s and that on the DTV site it advertized black receivers. I can care less about the color of the receiver, but I would like the latest in tech from DirecTV. Would I benefit from a HR-21, 22, or 23? If so I will call CS and ask for one of these models, if not I will enjoy my HR-20. Thanks for the advice.