I can tell you what I did..
I had bought a 65" Samsung EH6000 which failed after one hour. Just wouldn't start. Samsung is plagued with quality control issues since they became a market leader and started cutting corners thinking people will continue to buy the brand.
My previous TV was a Samsung so I wanted to stick with them. No more. I looked around and realized there are options but almost all are flawed in some way or the other.
You may want to roll the dice and get another Samsung.. maybe the 7500 series. In my humble opinion LED-TV landscape is now easily divided based on your needs:
1. More contrast, brand name, punchy picture great colors -> Samsung
2. Size choices, good panels, decent colors --> SHARP
3. Awesome movie-like 3D, fast response panels, decent viewing angles, and are ready to battle frustrations and coerce the TV to give acceptable colors --> LG
4. to spend more on comparable quality --> SONY
Insert pithy comment here