How will your real estate tours be lit? Available light, indoors? That could make lux rating a factor. Interviews are best done with multiple (at least three) cams. A one-cam, talking head interview isn't much fun to watch. Quality isn't much of a factor for your web video, but could be for your DVD audience, of course.
I guess the light is your most important consideration, because after all, that is all we ever record. We don't record landscapes, people, etc. - we record light. Poor light can make even the best cameras look bad. You might consider an event cam like the PD-170 or VX-2100. They make colors look super in normal household ambient lighting conditions. But you'd have to give up 24p. I'd probably go with the 1-Lux cam.