I have Motorola HD 2-tuner DVR which is I believe unit 6412, with Comcast service. I am thinking to get another DVR, which would be either: Pioneer DVD-R/W with hard drive or second Motorola DVR box I assume if I add second DVR I will have 3-4 tuners, so I will be able to record 3-4 programs simultaneously? And I will have much more space for recording. Or, if it will be Pioneer I will be able to backup movies to DVD. Is it going to work? How would I connect second DVR? I have Pioneer 5045 plasma TV. Thanks!