A fast router is important towards having a reliable network. You are also going to need decent WiFi adapters to achieve fast connection speeds. The D-Link AC1900 WiFi Adapter is worth a look. It is a dual-band wireless adapter that delivers speeds up to 1300Mbps on 5GHz and 600Mbps on 2.4GHz.
The device has Smart Beam technology for improved coverage. It can be set up fast with the WPS button.