Cox offers the Cisco modem for $80 but I opted for the Motorola from Best Buy for $99 because 1.) I'm partial to Motorola's modems, and 2.) I had a $35 dollar store credit to blow at Best Buy anyway.
I think you can find the motorolas online for cheaper.
I get internet and phone from Cox. Do they have a DOCSIS 3 modem that can handle the phone?
PS I live in Tulsa and I don't know whether it is available here yet.