Ok I have a Sonos system.
It is categorically the best streaming music system you can but and IS THE BEST gadget I have ever bought, period.
Upto 32, it may have changed, zones all playing different music!
I have 2 zones
Anyway, you only need the bridge if you cannot connect the S5 to your router with a cable so if you can connect it don't bother with the bridge.
I am going to buy an S5 this year but I don't need the bridge as I have a ZP90 connected to the router.
I also have a ZP120 with a Speakercraft stereo ceiling speaker in the bathroom.
I use a Dlink DNS-323 NAS connected to the router full of music and I also use a Spotify Premium account which streams at I think 320kbps.
I use Lastfm to stream and its also an excellent internet radio.
Any specific questions just ask.