GDK2,
I was hoping that someone would add a little to this discussion, but since they haven't, I at least wanted to address your question.
My best suggestion would be to go to the store and take a look to see if you can see the difference. Check out the panels colors, brightness, and even aesthetics to see which one best suits your taste.
Keep me posted.
--HDTech
Can anyone tell me if there is a big difference in picture quality between the Ln46a540 & LN46A550 the 540 has 35,000:1 dynamic contrast ratio & 550 has 30,000 but is noticeable ?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic