I can tell you what not to buy - a smart TV. Buy a good screen and buy one of those small computers. Install normal deskop OS on it. Why? Less vendor lock-in, less tracking, more freedom, easier to repair.
Get yourself Kodi. Things like Netflix in 4K resolution can be watched in the browser, 1080 resolution - anywhere. Games - Steam or some other place. Some ISPs now offer the ability to watch TV channels online in a browser as well.