Hi, I am an old Dish Network customer with a Hopper w/Sling receiver. I just upgraded my TV to an UHD HDR 4K and want to take advantage of it. On the Dish website you can fairly easily see their different DVR's. When going to DirectTV's site, I cannot find info on their DVR's? Where can I get information to help me decide to switch or not? What are the DVR specs? How many tuners, etc.?