Panasonic 58DX902 on their eBay refurb store if you can still find one.
Otherwise one of Samsungs KS range, although hard to find now (KS7000,7500,8000,9000).
If you can't find those 2016 models anymore I would wait for the price of the Sony XE90xx or even XE93xx to go down. Samsung have the Q series too, but they are also overpriced and aren't much better versus last years KS range.
Panasonic, LG and Hisense don't make any capable HDR LCDs in 2017.. at least not yet. Only LG, Sony and Panasonic make good HDR OLEDs. But the most you can expect to see 55" OLEDs come down to around £1500 next spring if 2016 pricing is anything to go by.