Looking to buy Comcast approved Modem w telephone

HOPE this is correct category...
Have comcast and have leased modem for 8 years - not economical!
Comcast has a list of approved modems here: http://mydeviceinfo.comcast.net/?s=v&so=0&e=0&d3=0&tier=-1&sc=504

Which one of these should I buy to ensure max future-proof and speed???
?? What is DOCSIS 3.0 exactly?
?? Are all DOCSIS 3.0 IPv6 capable? Only have 2 on the list and neither are telephone hardware...
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More about looking comcast approved modem telephone
  1. I think Motorola cable modems are the best.
  2. you can contact the ISP.............
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