I was very happy with my 50" Samsung smart TV until its screen went, just 8 months after the 5 year guarantee ran out!
After all the research, Which Magazine etc, I got an LG 50um 7500pla from Richer Sounds @ £469.
It came with a 6 year g/tee. Magnificant picture with lots of options, and particularly excellent sound quality, so much so that I prefer its own internal speakers to feeding its sound out through my BOSE sound system. Performance wise, it beats my previous Samsung which cost £900+
The only negative is that it didn't come with an instructions manual. That's a biggie, for unless you're tech savvy it's a nightmare. When I raised this with LG they say all the instructions are available on-screen. They then sent a photocopied "kind of" manual which isn't much use.
I eventually got the hang of it, but while it is excellent, be aware of the lack of instructions.