I have 3-story house, Wi-Fi router (it's a combo modem-router) on top floor, often work in basement at opposite corner. This was $160 2 years ago: NETGEAR C6300 AC1750 CABLE MODEM
Our speed is 450 Mbps down, 18 up, 5+ devices - - tho of course speed is slower at distance (still over 140 Mbps)