If you have a cable modem, I highly recommend buying an Arris SB6190 Surfboard instead of renting the one that Comcast or your cable provider rents for $10/month. This modem has 32 tuners and can get you much better downloads than what the rental modem can provide. I am paying for 60 but realizeing 248 Mbps down and 12 Mbps up.
Naturally you NEED a WiFi router, which you can buy from Walmart. I suggest the 802.11AC at best, or the 802.11n if you are buying one.
I've got a feeling they(others)are going to start to make up for cable cutting by charging up the wazoo for internet.