There's one thing I don't get. Prevailing wisdom (and some science) is that, given about a 7-8' viewing distance or greater, there is no visible difference between the two resolutions to the human eye. Personally, I think that's nonsense. I hate, hate, hate seeing the pixels of a digital panel, coming as I do from a very high quality HD RPTV where there is no such thing. On my brand new 50" 1080p plasma set (Panasonic TH-50PZ750U), from 8' away, I can easily detect the pixels and it does bother me a little. The picture is stunning without a doubt, but the digital matrix of the image is certainly noticable. Given the same size screen on a 768P panel, the pixels would be about twice as large and I imagine this would have driven me crazy. As it is I'm wishing I could put a bit more distance between me and the set so my eye won't resolve the pixels. In short, 1080P all the way.
Incidentally, I watched a couple of well-mastered, widescreen Standard Definition DVD's (Farscape and the new Dr. Who) and was simple floored by the quality. I found myself judging the main character in Farscape for having too much makeup on, something I could not detect on my previous HDTV.