if they will play Blu-rays it should be 1080p. if only upconverted dvds then 720p will be fin.
if they like real life looking movies 50,000:1 is great. if they want it to look like a normal movie in the theater then 900:1 is fin.
6 millisecond to 4 millisecond is around normal on newer HDTVs I'm not to sure how it affects movies. but for games you want the lowest refresh rate you can get.
on Blu-rays 120Hz is a must. for me upconverted dvd players dont need it is much.
bottom line is if your parents are like mine they dont care about technology and will be happy with the lowest one you can find. if not then may I suggest the LN40A650 or LN46A650 for a higher end HDTV.
I love my LN46A650 for the price it
