With both of those brands, there are different levels. In a 42" only the lowest level has them, but with a 50" you can look at several levels or series. With regards to PQ, how much of a spread is there between the different levels or series of both of these brands and what are these levels? Like for a samsung in 09, there was the 4 series, 5, 6 and so fourth. Is the 5 much better than a 4 in hd pq, or would most need to move to a 6 series to see pq differences? What do you look for to notice the differences in a regular living room?