I JUST went
through this... ended up with a 51" Samsung Plasma...
HERE
Here's a quick little how-to....
Select your screen size. This depends on the size of the room and your personal preference. You can also find "screen size calculators" on the internet with a quick search. This will help you determine the best size tv based on your room size and how far you'll be sitting from the screen.
Select screen type. There are 3 main types... LCD, LED-LCD, and Plasma.
I love Plasmas. They last just as long as the other screen types and have the best-looking picture. Plasmas are also a lot cheaper than LED-LCD and LCD. Only drawback to a plasma is that the screen is highly reflective and they're not as bright. If your TV has a lot of natural light, you'll get a lot of glare off your plasma... if you have a dimly-lit/dark room or mainly watch at night, Plasma is for you.
LCDs are less reflective and brighter than Plasmas. They are good for brighter rooms. They're a little more expensive than Plasma. One of the problems with LED/LCD is called "motion judder" . Look for the hertz-rating of an LED/LCD TV. 60hz is standard and can make quick-moving images appear choppy. To counteract this, manufacturers make TVs with hertz-ratings of 120 and 240... but, the higher the hertz, the more expensive the TV!
LED-LCDs are the most expensive, newest, and brightest. These have the same motion problems that regular LCDs have... especially with bigger-sized TVs. Anything over 40" should have a 120 hertz refresh rate... anything over 50 should (my opinion) be at 240hz. These TVs are very expensive, but the pictures are beautiful. Not as beautiful as a Plasma (my opinion), but close to plasma-quality... and able to be used in a bright room.
I was recently shopping for TVs, and I completely ruled out 720p. It's old technology. a 1080p is just about standard these days, and all new
devices (blu-ray players, cable boxes, DVD players, game consoles, etc) are geared toward 1080p resolution. Unless you're on a very tight budget, don't get a 720p TV! Screen size also comes into play here... for smaller TVs (40" and lower) 720p looks ok... but anything bigger and it looks rough...
A little more about 1080p... very few
devices can output a TRUE 1080p signal... blu-ray players and gaming consoles are the only ones I know of. Cable/Satellite companies currently broadcast in 1080i because of bandwidth issues. 1080i is definitely better quality than 720p... so if your cable company is broadcasting a 1080i signal to your 720p TV, your TV will dumb-down the picture... and it wont look as good as it could. Buying a 1080p TV will also keep your investment more future-proof. If you ever decide to get a Blu-ray player, you can use it to it's fullest potential with a 1080p TV.
To shave a few bucks off of your purchase... most MFRs make several different versions of the "same" TV. 51" plasma for example... you can get one with Internet, with wireless internet, with 3d-ready capability... or without! If you dont care about internet/wireless internet or 3d-ready, then find the model that doesnt have that stuff and it'll save you a few hundred bucks!
The 51" Plasma I got was $900... Other 51" Samsung Plasma models with internet/wireless internet and 3d-ready... are $1400-2000!!!
Hope that helps!