Taximania ( one of the best posters on here ) is your man , he did a lot of research on this subject last year ,however I appreciate its a fast moving and quick changing topic and is also very subjective .
Looked into LG , but decided against , also Hisense , fabulous value but a little unknown ( think they will become very acceptable and majorly popular , John Lewis love them ) , decided on Samsung , went for a 60 inch KS7000 and a 65 inch KS7500 ( curved ) TV's , absolutely love them , think they are currently slightly above your budget but would advise you to take a look
With TV's I think the thing you need to accept is that as soon as you buy the latest tech , its out of date within months