Depends on your set up, house, what you use or plan to use. You dont have to spent a lot of £££££££££££ on a "Good" router. you're just paying for the name. eg. NETGEAR. I have an AC1200 TPLink at hom (bought it 5+ years ago) still going strong. it has dual band and i've never had issue with it.
It totally depends upon your location, home structure and your usage. But i recommend Netgear router, because i am using this from last 2 years and this is perfect and meet all my requirement. It's Setup and installation is easy. You can setup or configure netgear router by yourself.