I read somewhere that Samsung OEMs most of the LCDs of many brands including some of those you mentioned. Sharp also OEMs and is said to be the leader in LCD manufacture. I know Sony uses Samsung LCDs, but I'm at a lost which other brand uses which OEM.
Frankly, any of those brands should have excellent LCD resolution. Forget about HDTV-ready. Make sure it's HDTV, period. With digital tuners and the right features like HDMI terminals and 1080p upsampling. After sales support is very important. In this area, I would think Samsung may have the edge.