I did consider all these models when i was looking except for the JVC. I ended up with the sony 51HW40. A great TV and the right size for my room. Couldnt be happier. As far as JVC products I don't support their products, I have never have much luck with them in the past. Good luck.
I love my JVC. I've only had it since last Monday but its GREAT. Out of the box (well, I bought a floor unit so there was no box ...) it had an amazing picture except on some channels, but that problem was completely the fault of digital cable and was fixed with a quick free Comcast tech visit. I don't have an HD or progressive DVD setup, but everyone that has seen the unit has been impressed. "A Bug's Life" looks stunning and even something as dodgy as Cubs games looks great. I got my unit for $1700 plus tax and delivery.
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