Router for Audio Streaming

I wouldnt worry too much about the router as its being fed noise from all over your network. I would concentrate on isolating your streamer/hifi from the network, first with a dedicated switch ideally with an uprated quiet PSU. This will act as buffer reclocking and transmitting a fresh signal, removing a large amount of the high frequency interference from the ethernet signal, from there run the best ethernet cable you can afford to the streamer. You can also add a passive filter in here which would clean up the signal before you reach streamer.

Router > Standard ethernet cable > Switch with quiet psu > your best ethernet cable > Passive ethernet filter > Streamer 

You can upgrade the router too, but anything happening before the switch is likely to have far more subtle effect on SQ.  I would add a simple switch D-link DGS105 with an ifi ipower PSU, both can be bought and returned from amazon for $70 and this should give you a noticeable improvement on its own, or atleast is very good risk-free way of experimenting and see if you like the results.

A router that will actually  sing a beautiful  song. 

https://www.festoolcanada.com/products/routing/routers

@yoramguy1, I use a $100 Calix Aspire CAT6 router that was provided by our cable company, and it does its job without any fuss. My point being that you don’t need a fancy router to stream music and watch football at the same time. What you do need to do as @teknorob23 suggested is to isolate your streamer from the network. And to that end I have two moderately priced network switches with their own iFi power supplies in cascade, or in sequence back to back as it were, a decent Ethernet cable between the two switches, and then a passive ENO Streaming filter before the signal ones to my music server. 
 

  To say that I was skeptical about even trying this type of setup would be a humongous understatement. But taking things slow and going step by step eventually convinced my brain that what it was hearing sounded much better than the music did before. 

@retiredfarmer I actually have a 1400 and a 1010 router. They are the best routers I own, puts my Bosch and my Porter Cables to shame. And you can use an upgraded power cord with them. 

I use a Pangea power cable on my Festool.