I have a 4504 and a Tivo series 2. I'm looking at replacing my Go Video VCR with a DVR. I know I can have two series 2 Tivos running, with the remote control from one not interfering with the other. Can this be done with a 4504 and 5000 series? The third DVR will be used for those rare times when three shows that I'm interested in are on at the same time, like last Sunday, with 100 Years of Bob Hope, 60 Minutes, and Gilmore Girls. I can't stand the quality of VCR anymore.