I would say ditch 3D for now. It's gimmicky and good for theaters. Will give you a headache if you use it in your TV which is used for prolonged viewing.
Coming to your choices of TV, I see you have decided to go with LCD technology.
Sony EX520 would be my preference but the Samsung models given above are equally good.
All the stuff about internet TV, apps etc look unnecessary to me. Do not pay for features you wont use.
I would suggest you go to the showroom and audition the TV with some of your movies etc. Take a DVD along with you for comparison. You might notice subtle differences and might be able to choose one. Just hope they are factory calibrated properly. Coz changing the settings one TV can act like another.
Avoid the Sony NX series, unnecessarily glossy and glaring.
Actually I'm very skeptical this time coz last time I bought Sony Home Theater which doesn't have USB Support and now I have to burn every movie which I watch on a DVD rather than playing it directly using USB Stick.
So considering this experience I thought maybe 3D will be the future so maybe it makes sense to buy 3D now rather than down the line.
What do you mean by LCD Technology? Are you saying compared to Plasma or LED?
I agree completely with you about the internet thing I don't think it's really required.
Thanks for your suggestions!