I'm going to max this new unit out with 1TB internal +1TB external. We're running now with a 750GB Series 3 (upgraded before purchase) and this new TV season is killing us; I record everything as "Keep until I delete" and I'm having a hell of a time keeping ahead of it. We're recording a lot more than we're watching, and planning to get to it later--perhaps in the summer, or maybe when the writer's strike causes the current season to dry up. Turning on TTG/TTCB has improved things because now we have the option to off-load shows to PC storage, but we need another Series 3 anyway to take advantage of MRV and (equally important) to add another couple of tuners. Although we have other ways to record (capture cards, Nextcom-modified R5000-HD satellite and cable STBs, HR10-250 TiVos, HDHomeRun, etc.), the TiVo Series 3 is by far my favorite platform for this so I hope to move to it as much as possible (in place of other flaky media player alternatives). I also plan to add an external 1TB drive to the original 750GB series 3. Which raises one more question (if you don't mind): will the MFSLive tools allow me to upgrade the already-upgraded-750GB Series 3 to use a 1TB internal, while still preserving all its recordings? From a quick perusal it looks like the answer's yes, but I haven't looked in depth yet. Thanks very much for all the help.