A:
If you want a modem and wifi, I would recommend my setup:
- ARRIS / Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
With:
- Netgear N750 Wireless Dual Band Gigabit Router
Using a non-gigabit router connected to your cable modem will lose data speed from the modem. I have the Xfinity Blast 50, and from my modem, I get 120Mbps. With my new router, I get 120Mbps over wifi. My old router capped out at about 22Mbps over wifi.
Note: Make sure you call Comcast and tell them you want to activate your own modem. They activated my modem with no hassle at all.