The Netgear Orbi High-Performance AC3000 Tri-Band WiFi System, is a high-end routing system with both a router and a satellite. The Orbi AC3000 has Tri-Band WiFi, with an extra spectrum for super speed internet access. It covers up to 5,000 square feet so you can access your broadband from anywhere inside the house, or when you're out in the garden. The satellite has four Ethernet ports so you can connect from multiple devices, without compromising quality, so no more family squabbles!
Stock Update: Seems to be available in South Australia stores.
I've got RBK23, if my aim is coverage. Is that better? Since NBN is only 100mbps anyway. No network sharing files.