I took a chance on one of the cheap ebay wireless ones, and I'm just finishing up the installation. It's only a 23' footer but it seems to work just fine.
If it doesn't last, then I'm out $70 and not $270. Or more.
Obviously, I haven't road tested it and no idea on it's longevity yet. But, I have to admit, so far so good.
The cautions:
- the instructions are worthless. Chinglish at best. But with a little fiddling and a 12V power source, it took about 3 mins to figure it out.
- not an issue of the camera, but I'm spending most of my time trying to figure out a nice place to mount the monitor. I hate visible wires so I'm trying to come up with an unobtrusive spot
- the wireless antenna on the monitor sticks out a bit more than I would have wanted
- I wish that the cable that feed power/video into the monitor had been positioned better
If folks want to know more, I can post pictures of the progress.