It depends on what the needs are and the max speed of the wifi from the provider. I myself have Google Fiber and will be purchasing an Asus AC-5300 Tri-Band router when I can. For most internet though an AC-1700 router is sufficient, that's what I have now and it'll handle 500mbps. It's even essentially free if you have T-Mobile, $20 down and you can return and get your $20 back.