I want to replace the router/modem Comcast with a high quality for streaming

After reading this thread, I checked my actual internet speed compared to what I am paying for and found it to be only about half what it was supposed to be.  The Comcast/Xfinity website was helpful by showing that my modem is outdated, the non-Xfinity modem options that are considered current, and a link to the speed test.   I then purchased a new DOCSIS 3.1 Gigabit cable modem from the list that will hopefully provide the speed I am paying for. 

I feel lucky to have found this thread.

Starting at the Basics, I am at present purchasing electrical cable for my home which is to undergo a substantial renovation.

My electrician friend assisting with the new electrics is aware a separate earthed spur is wanted for the Audio Set Up. 

The way things are unfolding, the Audio may be reduced to a Streaming Only arrangement, FLAC files and possibly a Hired Music Service as well.

What is the best options for me in relation to having Cable concealed in the walls?

How many wire runs is required?

Any info to help plan will be great. 

@pindac Cat 6 or better, shielded is plenty good enough for all streaming. 1GigE has more than enough bandwidth for even video.

If shielded, you may want to ensure your wifi router has grounded plugs.

@mitch2 “…that will hopefully provide the speed I am paying for. ”

Good luck with that. Bird dogging Verizon to get what you pay for is a full time job. When you don’t get it with a third party modem / router they will claim it is your router. 
 

Don’t get me going.

As strange as it might sound, this is a real Newbie on such an area of Data Transfer. 

How many Cat 6 or above Cable Runs is sensible planning?