So a question for my tech friends: Im looking to upgrade from an old plasma tv to 4k. Im pretty much set on a TCL 6 Series Roku tv. I love Roku, so it pretty much must be in the choice. Is there anything i should know going in? I know i need to upgrade my HDMI cable and eventually get a 4K blue ray player. We're getting a 55 inch, so I'm not looking for a huge screen, im more interested in quality. Thanks!