I would advise against using those X10 products for your application. They are as far from an HD signal as you're going to get. Don't get me wrong, I love them and I own the audio/video sender/receiver myself, but I use it for simple broadcasting of the video output from my ATI AIW card to the TV, mostly for watching downloaded TV episodes that are crummy quality anyway. Mostly, I use it to transmit audio from my PC for parties. While it's better than having yards of wires running through your house, the video quality is quite poor, and if someone walks in-between the units, the audio will crackle.

I'm a big X10 fan (despite their ads), but I can't imagine using the devices to send video to a plasma screen.


ps-I believe the difference in price is due to one having a coax connection and the other just has RCA jacks. At least I think that's what's going on. I can tell you that both include the transmitter and receiver. The whole package is called a "video sender."