1. In my opinion, I think that LCD are better because there cheaper, they're are usually used for gaming. Plasma are just a little bit better, but more expensive.
2.Yea, if it says 1080p it can produce anything lower like 480p 720p.
3. Ummm, I dont know.
4. Get component cables. There have better Resolution and picture on the tv. It produces more lines which gives a more crisp and clear picture.