I've got the same problem choosing between models.
In 55inch, Samsung list 11 models!!
Dunno if I've got this right, but 6 series models are edge lit, 7 series might be zoned, and series 8 might be zoned as well, but have more of them.
Rest of it seems to be quad or dual core, and tiny differences, but it's not clear what they are.
One other thing, with there being so many models, stores don't generally have the model you may want to view, so how do you choose? Buying blind seems to be the modern way to do things.
Personally I'm trying to find out as much as possible about the SAMSUNG UE55F6800 as it's availble at a good price. But I would like to view it to check out if 'blooming' is a problem for me. That seems impossible to do.