I have Comcast Xfinity internet & voice (no tv). I want to replace the Cicso with my own equipment to get better range and save on the rental but I don't know what to get due to needing the voice. Can I get separate router and EMTA modem or do they only come in combinations? I have the 200 Mbps download speed plan. There are usually only 2 users in the home, using 2 cellphones, and/or 2 laptops or tablets. Thanks!