If you want to keep the Roku operating system I’d probably just get a Roku brand RokuTV. I’ve found it nice not to have any additional cords or equipment with it all built in. Plus, you can still plug in an Ethernet directly if you want to. They are very affordable and have a couple tiers depending on what you’re looking for. Yes you could definitely find a tv from other brands with better picture and audio, but you’ll also pay a lot more and still need to use your external Roku devices.