For wireless, you are stuck with Sonos, Squeezebox etc., so the only improvements you can make are by reclocking or having a competent modder improve these devices. The advantage of reclocking is you get a separate dedicated high-quality power supply driving the reclocker, which contains the new master clock. This is difficult to do with mods. The clock is better and the power is cleaner so you get lower jitter. The Synchro-Mesh is such a device and used often with Sonos, Squeezebox, Apple TV and AirPort Express.
The downside of wireless is that you will be limited to 24/96 files.
If you want hi-res file capability, you will need either wired network or USB interface. Both can have longer connections. With USB you can use Icron USB extender to go longer than 16 feet.