Hello,
Just created an account here.
From my experience, the 20"American Dynamics LCD is the way to go. Model ADMNLCD20. It offers all the the normal CCTV monitor configurations, loop through, BNC, RCA, S-Video, PC connectors and happens to be the clearest one I've tried. It's also the best one for PTZ control. Very near the quality of a good CRT. It goes for about $1,000.00 CDN. Expensive compared to normal LCDs but blows the doors off of the other CCTV LCDs like marshall and totevision.
This reference is only for the 20"LCD. Apparently the other models aren't as good. I've also tried the larger LCDs. I wouldn't use them unless you're doing a large command center or possibly using the PC interface and not he RCA or BNC.