Stock antennas are a good one size fits all solution and work well for most people with clever positioning. Add some high-gain antennas to your router to customize your experience and improve your signal.
D-Link provides a good selection of Wi-Fi extenders with the DAP-1720 delivering impressive AC1750 speeds in a reasonably sized package. It even has an Ethernet port to get another wired device online.
Using your own money can save you money over renting one from your ISP and Linksys supports a wide range of speeds. If you can get by on 686Mbps, a 16 channel modem like the Linksys CM3016 is a great value.
Linksys has Wi-Fi extenders that cover the gamut of speed and features. The RE9000 is the most technically advanced but takes up a lot of space while the RE7000 hits the best balance of speed and form factor.
AmpliFi provides the best package with a feature set that forgets nothing and an appearance that looks like an appliance from the future. Google and Eero make some great options with more wireless focused entries.
The AmpliFi HD Mesh Router is an extremely compelling product. It is visually modern and comfortably traditional at the same time. While it provides more on the spec sheet, the overall experience with Google Wifi remains superior.
If you have decided on the AmpliFi HD Mesh Wi-fi System, the next question is what to get with it. The Teleport can bring your network with you anywhere while the MeshPoint looks to make the most of what you have at home.
The Nighthawk AC1900's wireless abilities will feel redundant if used with Google Wifi. If you want to add wired capacity good enough for games to your mesh network, consider a wired only switch like the Nighthawk S8000.