Mike,
Nothing has yet to compare to the resolution that Apple pushes through their screens. The TV is fairly close and it took me a good half of a week to calibrate the TV just right to get it's sharpness and color quality and contrast as close as possible to the iMac. Even still, the TV has better resolution and color quality than the Cintiq (you'd think being a company that develops graphics tools that Wacom would get their act together and create better color quality for their Cintiqs) TV's are limited in their resolution, but as long as you know how to 'fake' the look, it can work just fine. Also, I'm about 2+ feet from the 43" screen- the further I am from it, the less I notice the resolution. My main reason for getting the TV was because I had started my linework in Illustrator for a cutaway of my own design for the War of the Worlds Tripod:
http://www.stevenwhowardart.blogspot.co ... e%20worlds When the illustration is complete it will be printed 14x40." I was previously working on a Mecha cutaway, but had issues with putting too much detail in that would be obscured when printed at scale because I wasn't able to work on the project at printable scale (I could work at scale in Illustrator, but I needed to see the overall mecha to make it work out and be balanced in its revealed details)- there truly is a thing as too much detail.
The 43" will allow me to better balance my distribution of detail on the cutaway of the tripod. Most objects I wouldn't be running into issues such as these, but the tripod cutaway I am doing is of my own design through and through. There are no particular specifics yet of what exists on the inside and I will develop that as I go.
TVs will always be behind on the quality of computer monitors. You just need to know what you will be using it for in regards to your art and at certain points in your art, know when it is better to use the computer monitor (for example- ensuring that all your colors work right). That being said, everyone I have talked to suggests SONY HD screens. I'd say they are your best bet.