This is 4k and 10-bit. It also has great reviews across multiple sites.
Price Spy has the average price at £650. More details here: http://pricespy.co.uk/product.php?pu=3857163
I don't think you'll find another 10-bit TV with these specs for this price any time soon.
Television picture quality:
LED TV Screen.
Certified Ultra HD display resolution.
Screen size: 43 inches.
Motion rate 400Hz.
Viewing angle 89/89 degrees.
Resolution 3840 x 2160 pixels.
1 SCART socket, 3 USB ports and 4 HDMI sockets.
VGA input socket.
Suitable for wall mounting 200 x 100 bracket.
Dolby Digital Plus sound system.
10 x 10 watt RMS power output.
Features USB recording and video playback.
Freeview HD digital tuner.
Saorview digital tuner (Saorview can only be received in the Republic of Ireland).
CI plus slot.
Size of TV H56.4, W96, D4.5cm.
Weight of TV 12.3kg (unpackaged).
Size of TV with stand: H61.2, W96, D21.6cm.
Footprint of TV 96cm.
Weight of TV with stand: 13.2kg.
Energy efficiency information:
Energy efficiency rating: a.
On mode power consumption 80 watts.
Annual power consumption 114kWh.
Standby power consumption 0.5 watt.
This product contains lead.