Odds are you've seen an HDR photo, so you know what the added range can do for an image. Now imagine that image as a video in 4K resolution, and you've got an idea of what to expect from the Vizio Reference Series TV. The 65-inch set is the first on the market to Dolby Vision, using quantum dots and other cutting-edge tech to deliver a picture far beyond that of any common set, with over one billion possible colors. It's powered by a six-core processor, supports both 4K and HDR streaming content, and has a built-in 3-channel sound bar, paired with an included wireless 10-inch subwoofer and satellite speakers for out-of-the-box 5.1 surround sound. Also available in a staggeringly large, $130,000 120-inch model.
With access to more 4K content than any other streaming box, the Roku 4 makes a strong case for taking up an HDMI port on your UHD set. Its quad-core processor and 802.11ac Wi-Fi let it support 4K streams at up to 60 fps, and a dedicated 4K spotlight section makes it easy to find high-res content from Amazon, Netflix, Vudu, and YouTube. Its remote lets you search for shows and movies using nothing but your voice and has a headphone jack for private listening, and the box has a dedicated button for helping you find it when it's slipped down between the cushions on your couch.