I also got a 50PK590. Awesome for the price. Only negatives which really don't bother me much is it has some IR (image retention) and the screen is ultra reflective.
The IR issue is not too bad though and very manageable. Say your watching a channel with a logo for a few hours, when you switch the channel you will see a slight ghost of that logo still there. However within a few minutes it will go away.
As for the reflections, I just close my curtains and then the problem is gone. But if you don't want to do this, then you might as well go for a LCD.
I paid £650 for my one about a month ago now and paid £65 for 5 years warranty. If anything goes wrong they will come fix it or replace it if they can't fix it