In in few days I should receive my first High Definiton TV. I currently have the Panasonic DMREH55S connected to Digital Cable via a Cable Box and my old Standard Definition TV. Once the new TV arrives I will get a High Definiton Cable Box. When I hook up the Panasonic DMREH55S to the HD Cable box (signal coming from the HD Box to the Pannsonic DVR) will I be able to view content in HD via the Panasonic? If not will there be any improvement in picture quality both viewing and recording/playback by going through the HD Cable Box over the regular Digital Cable Box?