New TV - Plasma, LCD, or LED - Discuss!

[grizzle]

Ok, after watching movies on my 46" Sony CRT for the past 10 years, it is time I finally catch up and get a flat screen television. I have been trying to research all the various pros and cons of the various TVs, and not only is it a whirlwind of info out there, many of the discussions seem circular and without conclusion. So, I am calling upon my fellow techie geeks out there to lend a hand.

I am looking for a flat panel widescreen between 52"-60". I don't want to spend more than $3k, but would prefer to keep it as close to $2k as possible. I am a semi-pro photographer and a budding filmmaker, so when viewing my, uh... "art", on the TV, I need colors to be as realistic as possible, black blacks and white whites, and motion as smooth as possible. I don't own a console gaming rig right now, but may in the future. I have a huge DVD collection, though will start buying BluRays when I start converting, so need something that makes DVDs and BluRay both look good (not sure if this is the TV or the BluRay player, or both). Thickness and weight of TV are not as important (any of these will be better than my 100lb CRT), but still might play a role.

Here are a few that I am looking at. These are just a couple examples. Please feel free to offer other suggestions along with any and all advice:

LED:
Samsung 55" LED
<!-- m --><a class="postlink" href="http://www.amazon.com/Samsung-UN55B8000-55-Inch-1080p-HDTV/dp/B0028YB8MA/">http://www.amazon.com/Samsung-UN55B8000 ... 0028YB8MA/</a><!-- m --> (240Hz)
<!-- m --><a class="postlink" href="http://www.amazon.com/Samsung-UN55B7000-55-Inch-1080p-HDTV/dp/B001UHMVR2/">http://www.amazon.com/Samsung-UN55B7000 ... 001UHMVR2/</a><!-- m --> (120Hz)

Plasma:
Samsung 58" Plasma
<!-- m --><a class="postlink" href="http://www.amazon.com/Samsung-PN58B650-58-Inch-1080p-Plasma/dp/B001W6NU9Y/">http://www.amazon.com/Samsung-PN58B650- ... 001W6NU9Y/</a><!-- m -->

LCD:
<!-- m --><a class="postlink" href="http://www.amazon.com/Samsung-LN52B750-52-Inch-1080p-Charcoal/dp/B001VKY7WU/">http://www.amazon.com/Samsung-LN52B750- ... 001VKY7WU/</a><!-- m -->


Questions:
1) Is there much of a difference betwen 120Hz and 240Hz?
2) Is Burn-In still a problem for plasmas?
3) Are LEDs worth it if they are not backlit?

Any and all input would be greatly appreciated!