I do this a fair bit, we just installed a relay screen system like this for a concert hall in Northampton with 1 camera, 3 lcd screens and 1 projector across 3 rooms. Transmission is via HDsdi (for low latency, quality and long distance) with hdsdi to hdmi adapters for each screen. The camera is a cheap outdoor hdsdi security camera for about £100 Camera cost would be from £100 to over £50,000 it's entirely up to budget. Given your brief, I think you need at least full HD and spend a fair bit more than £100. The quality of the camera will have a great deal of effect on screen image quality. The most important question is what's your budget 100's or 1000's? (pm if you want)