Looking to replace a Comcast Modem with Internet, Phone & TV service on it

I’m working with a client that has Comcast digital phone service, Internet and HD TV service in their home.

They have following services being provided on the one modem that also provides WiFi:
- One digital Comcast phone line
- Two hard wired desktops
- Four iPhones
- Three iPads
- One LG tablet
- Three laptops running Windows 7
- Two HD TV's that access Netflix. Netflix stops and re-buffers a few times in every movie interrupting the viewing.

Here is the modem Comcast provided:
http://www.speedguide.net/routers/smc-smcd3gnv-docsis30-multimedia-voice-gateway-933

At times, their WiFi is slow and the wired internet speed appears to be choppy but my testing didn’t show a problem.  I ran a test at speedtest.net and found download at 80 Megs and upload sat 10 Megs.

They pay about $10 per month to rent the modem from Comcast. I'm looking for a solid replacement modem with much stronger WiFi and wired throughout, works with Comcast service and comes with solid tech support.

Your suggestions on a replacement modem is appreciated
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Tony GiangrecoAsked:
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adamdalgCommented:
Take a look at this.  Might give you some ideas.

http://www.cnet.com/topics/networking/best-networking-devices/802-11ac/
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adamdalgCommented:
Asus RT-AC68U Dual-band Wireless-AC1900 looks like a great option.
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Tony GiangrecoAuthor Commented:
That router looks like a strong unit but it's not a cable modem that replaces the modem from Comcast.
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adamdalgCommented:
Sorry, misunderstood the question. (:

ARRIS SURFboard SB6141 DOCSIS 3.0 Cable Modem
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Tony GiangrecoAuthor Commented:
I just found this page listing Cable Modems for Comcast.

Has anyone tried this one?
http://www.technicolor.com/en/solutions-services/connected-home/modems-gateways/cable-modems-gateways/tc8717

Here is the full listing page.
http://mydeviceinfo.comcast.net/
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Tony GiangrecoAuthor Commented:
After further investigation, I found the links I posted. They have answered my questions and now I have a solution.  I'm accepting my solution with no points because I was not presented with these links.

I appreciate the suggestions that were offered.
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