I think the Chromecast Audio is fine as well, especially as mine cost me £14 each if your wireless network is clean and you wish to stream network music files (currently), it's great and 'sounds' far better than you'd imagine by the price and visuals. Apparently VLC media player may support (Chrome)casting locally held music files too before too long and I await that with keen interest.

By the way, the little P20 passive preamp I make ought to be included if nothing else from the range, as it's 'only' £100 and doesn't 'sound' any different from the bigger more versatile models...