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

For Comcast/Xfinity I have been pleased with my Netgear NightHawk modem.

This connects to  Netear Orbi Mesh Router with an optical link to my streaming system. The optical link replaced a 50 foot cat-6 cable which was a rreal improvement.

Arris SURFboard modem and Orbi mesh with Comcast/Xfinity here.

Compatibility is simple, just check - most are compatible.

No problems whatsoever over several years. When these reach EOL I would consider upgrading within the same brands.

The Orbi mesh base router has ethernet ports. I wire one of them to a switch and then hardwire from the switch to my server (which is in the network room).  There is fiber in-line between the switch and the server for isolation. Also, hardwire from the switch to my streamer (which is in my system room) using fiber for isolation. Two other music systems have endpoints hardwired via short Ethernet cables to the two Orbi mesh satellites. So, wi-fi to the satellites and then short Ethernet cables to the endpoints.

No noise issues at all.

Good luck.

I’ve recently been introduced to streaming by my partner in XtremeFidelity.

i was the vinyl guy, not wanting anything to do with this internet thing.

i now spend 6 months in Florida.the system I’ve put together is amazing. 
each new upgrade component I’ve inserted in the chain just peels back more of the “crap”.

im to the point that I question whether I have an modern/router good enough.

System:

Bonn NX , Tidal Contros, Tidal Intra, Tidal Piano G3s, all Siltech 880 loom.

all components plugged into Equitech 2RQ.

@KR4 I am not recommending in line extenders! I am recommending wifi extenders.

OP, yes streaming has come a long way. My streaming system sound quality is the same as my vinyl playback… and both are very very good and in my investment level are about the same cost.

+1, @fastfreight

Instead of purchasing mass produced modem/switch that is not designed specifically for audio streaming…keep your Comcast/Infinity and add a high quality switch that specifically design for audio to filter noise. Consider adding Network Acoustics Muon Pro Filter between your comcast/infinity modem and your streamer. I am using a Telegartner Gold Switch with LPS and haven’t felt the need to upgrade in over 3 years.