I have had my Samsung LED for 2 a little over 2 years without problems. However, I have seen many people who have had problems with their Samsungs.
If I were you, I would go with Samsung or LG. If possible, I would look into getting a warranty through Squaretrade, as they are quite cheap.
As far as TV's go, IMO the best LCD's right now are the edgelit Samsung ES8000 and the backlit LG LM9600. Both sets have local dimming (the LG has true backlit local dimming), 3D and a dual core chip for a smoother smart TV experience.