The H25 is the newest receiver. The HR24 is the newest DVR. There is also the Home Media Center model HR34.
Edited to add: Both of these require SWM, which you mention you do not have. Given that, what you have is the most current that will run on your system. Thanks to others for noting this important oversight.
Edited to add: Both of these require SWM, which you mention you do not have. Given that, what you have is the most current that will run on your system. Thanks to others for noting this important oversight.