I just bought a 4K Phillips 55inch tv with HDR a few months ago and we like ours. I got mine from Walmart for like $359.00 . Make sure that it has HIgh Dynamic Range or you will miss out on the vivid colors.
It would be relevant here if he wants to know whether that TV will work with Dish's 4K HDR coverage, like they just did with the Winter Olympics. There, now the thread can stay in this forum. You're welcome.