Hi Ali:
You are getting some really bad information here. I have been an AV hobbiest for many years -- I spent almost $100k on my home system.
1) It is not true that an LCD will break down in the first year, if at all. For example, I had a very high end LCD display go on me after 14 months and complaints of similar failures are common on AV hobbiest forums.
2) Samsung makes some of the best displays out there. They are also known for a fairly high rate of panel failure and for having the worst customer service in the AV industry. I would avoid them.
3) Most televisions have poor sound. You can get a sound bar that will produce a surround sound effect for less than $500.
4) The best deals to be found can be on discontinued models. For example, you can buy a Sony XBR8, possibly the finest tv ever made, for less than a Samsung 850. Sony discontinued the XBR8 because they originally overengineered it and could not sell it at a profit. They and Amazon and others are unloading their stock (if any are still available).
5) Panasonic makes some great LCDs and their plasma, the Kuros?,. is considered one of the finest sets on the market. Unfortunately, the price reflects the quality and then some.
6) There is very little difference between the display quality of an LCD and a Plasma at this time. You don't want a plasma if you get bright sunlight in the room or have to view at an acute angle.
7) Ignore how the picture looks in the showroom; the settings are hyped for showroom display and the picture will not look like that when you get it home. Depend on reviews; they are done under typical viewing conditions. Be careful, however, many "reviews" are not done by objective third parties but by shills pushing a brand.
8) When you get your set adjust the picture settings to those that you will find on expert review threads. Some sets come out of the box with settings that are appropriate for store display rather than home. See the link below for a place to find expert settings and how to access them.
9) Go here to research brands that you are considering:
http://www.avsforum.com/avs-vb/
PM me if you have any questions.