Hi there,
At the moment I'm swaying towards a Samsung 6 Series KU or MU model, which sell for around £400-450. But would like some advice or suggestions please.
Sony XD80xx or Panasonic DX-700 are also options if you don't want 3:2 pulldown judder with films but they are likely sold out or more expensive.
What will you use the TV for? No TV at that size/price can produce HDR pictures with anything more than better colour.
High brightness and local dimming are all features of more expensive and larger tv's.