I'm going to try to be brief as I can. If you want to know more about what's behind the problems and such with various televisions, I'd be happy to explain. But in the interests of brevity, I'll just tell you what you need to know.
I assume you're talking about televisions, with a picture tube, also known as a cathode ray tube.
I'm going to use a term called "geometry". This is the shape of the image displayed on a screen. Good geometry would mean that you could display a perfect grid on the screen. Bad geometry would mean that grid would have wavy lines throughout, and some squares would be larger than others
You want good geometry. It's especially important for videogames, because that means all those polygonal lines and all those horizontal fighting game lifebars will be straight.
If you're going to get a regular, non-flat television, pretty much any name brand is okay. Toshiba, JVC, and Samsung are nice, and Sony's is a touch above. The geometry is decent out of the box for all of them. It can be tweaked, but usually only through the service menu, accessed through a special remote/TV button code.
If you're going to get a flat television, things get more complicated. Bad flat TVs will have fuzzy corners and awful geometry. Good ones won't. Bad and good often fluctuates between television sizes. The area around 22" to 32" is usually the worst. Sometimes, these problems can't even be fixed from the service menu. Even if they can, it requires a LOT of work with convergence controls.... At that point, you might as well pay for a professional calibration.
So how do you find out what's good and bad? Well, you'll need some kind of test image. Or you could put that service code into the TV at the store, and mess with the screen. But that's usually a recipe for getting kicked out.
A good test image would a grid, preferably a touch smaller than the full size of the screen. This is because TVs come with "overscan", where the image is displayed larger than the size of the tube. This hides the real edges of the picture, so you can't see the geometry problems. A smaller image lets you see edges, to check for curved lines.
It's actually a fun thing to do, getting your image displayed on all the TVs in the store. You'd be amazed at how bad the edges of some TV images are. But getting the store to cooperate can be a pain. You'll probably need to be very, very nice to a salesperson.
There's one more thing I should mention, and that's HDTV, as it pertains to videogames.
You may be tempted by the pretty, oft-widescreen HDTV displays. But there's a problem. All videogames, with the exception of a few for XBOX and Gamecube, display at a rate commonly called 480i, which we've been using for a long time. It means a lot of things, but it's mostly referring to the 480 lines of resolution displayed on a normal television. There's actually 525, but 45 of them are just used to give time for the TV to get ready for the next frame. Anyways, that's been the standard, for a while.
Here's the trick: HDTV
ONLY displays at 480p or 1080i. When you give it a videogame, it converts that 480i signal into something it can use. TV companies would like you to think that's just plain awesome, converting to a better signal.
But it's not. It can cause a lot of problems, and it can make older games look pretty ugly. The bottom line is, any conversion you do is only as good as the circuitry doing the conversion. And I haven't seen good circuitry yet. But I'm a bit picky.
So if you're going to buy a TV for videogames, I strongly recommend avoiding and HDTV, because 99% of videogames are not designed specifically for it.
That's about it. If I were going to recommend a TV for you to buy, for a regular TV, I'd go with a Toshiba or a Sony, whatever size you prefer.
If you were going to get a flat TV, well... you have to be very careful. I'd get a Sony, but not just any Sony. Recently, they changed around their product line, so it can be confusing.
I'd get a WEGA, but I'd get the top-of-the-line one. There's three levels of each size of WEGA now, and the most expensive one is basically what used to be the XBR line. The three models actually look physically different. The difference is more than superficial, though... the cheapest one has horrible geometry, whereas the expensive one has better circuitry, and therefore, a better picture.
The nice thing about the WEGA line is that they all have a 16:9 widescreen mode, where it actually blanks out part of the screen on its own. This tricks DVD players into thinking you have a widescreen TV. Should trick the XBOX too, which might be fun for Ninja Gaiden.
Anyways, that's what I'd get...
...if I was made of money. But I'm not. And I'm not really an expert on this, either. I'm just a fool that went buying flat TVs a while ago, and had to return, like, 3 of them, because I didn't do my research. Did you know CRT televisions are very, very heavy? -_-
If you need any more help, I'll try my best. I'm sure the rest of the board's gonna pipe up here soon, too.
- Ven