All TV's display in their native resolution. So if its 768 or 720P the signal is scaled or converted to that. In the case of 1080P a 1080i signal is broadcast at 60fps....the 1080P set holds half of the interlaced signal 540 lines and sends it whe the next set of 540 at the same time. So its 1080P at 30fps.
Determine what you like to watch, lighting conditions, seating distance and viewing angle.
Plasma has great viewing angles, fast response time (usually 4ms)outstanding colour reproduction, but the glare off the protective glass screen can be an issue if you cant control the lighting conditions.
LCD has similar viewing angles, but normally slower response time, often 8ms which can result in some blurring diring fast scenes and not the level of glare that comes with plasma displays.
If viewing angle is not a huge issue there is also LCOS rear projection, both Sony SXRD and JVC HDILA have announced new 1080P displays that are in the 10-12" depth range for a 60" set. They have great colours, black levels,response time, good for well lit rooms, but are not as thin as LCD or Plasma and dont have wide viewing angles.
Science says the human eye can not notice the added pixel count of 1080 sets vs 720 unless really close. I seem to notice a slightly better depth of picture between the 2.
Good luck.
