I am currently a Dish Network customer with SD equipment but am looking to upgrade to HD. Had DirecTV many years ago (before HD) and am considering switching back. We currently have 3 DVR's, one with 2 tuners. The 2nd tuner of the 2-tuner DVR is connected to 3 TV's, everything else goes to a single set. We were thinking of switching to 2 HD DUO DVR receivers (on Dish) which would give us essentially what we have today with a bit more flexibility. Just wondering what options would be available for a similar setup on DirecTV ? With the MRV option, do we need HD Receivers for each TV ? What if the TV isn't HD (and not planned to upgrade) ? With Dish the receiver will downscale if needed. Thanks in advance.