If you haven't pulled the trigger on a TV yet, I'd recommend that you give the Toshiba 310U series a good,long look. Last January, I bought a Toshiba 46" 300u3 for use as my primary set for around $600. Its color rendition is perfect, black levels are as good as anything I've seen short of a local-dimming lcd or plasma and, so far, it's glitch free.
I'm assuming the 310U series is a virtual clone of my 300U(not always a safe assumption). I believe it's available in 37, 46 and 55" screen sizes and has some level of internet connectivity(I think).
Admittedly, I'm favorably biased toward the Toshiba brand. I have a 32" Toshiba lcd used as a computer monitor and a 37" 200U in the family room, both purchased last year. Both of them have performed at the game high level as my 300U3. Down in the basement rec room, there's a twenty-two year old Toshiba 32" CRT that's still putting out an acceptable SD picture. Maybe I've been lucky...or maybe Toshiba is a too-often-overlooked but very good brand.