Actually, Dish does not insist on one DVR feeding two rooms. Some receivers are CAPABLE of feeding two rooms, but you aren't REQUIRED to do it that way.
I, for one, have a ViP622 in "single" mode, feeding my HDTV. I also have a 721 (dual tuner SD DVR, non MPEG-4, non-8PSK) feeding a 27" analog TV, and a 508 SD DVR feeding a 36" analog TV. When the 508 & 721 get phased out, I might shift the ViP622 to "dual" mode and connect my wireless video to it to feed another TV, and maybe re-rig or rewire to feed the third TV, all from the ViP622. Then I could watch any 2 video streams on the 3 TVs.
Some parts of the country have problems with 129. I think the bird is expected to be replaced in late 2007 or 2008. I suggest going with 61.5 if at all possible. Besides, 61.5 has the HD demo channel and 129 doesn't. Sometimes this channel has an aquarium feed on it, which some folks like.