The most popular TV we posted last year was the Samsung UN55KU6300, which includes a 4K panel, smart apps, and even HDR. We saw it get as low as $550, but the nearly identical UN55KU6290 is now on sale for just $500.
The only difference, so far as I can tell, is the UN55KU6290 doesn’t have a Smart Remote. If you can live without that, you’d be hard pressed to find a better picture for this price.