Currently setting up a Mac Mini late 2014, 8 Gb RAM, 1 Gb HD,(almost new) as a dedicated music server which I found on Ebay for $305. This model will run the latest Mac OS & thus the latest Audirvana. I used the free SW "Mactracker" http://mactracker.ca/ to find this model as it was recommended as the inexpensive alternative to a new Mac Mini. Mactracker lists the current price/value & has a link to the units available on Ebay. This model can be upgraded with an SSD if you're up for DIY and there are quite a few in various configurations available on Ebay. If you're happy with your setup this would be an inexpensive, easy way to go.I can't speak to the many alternatives, I'll leave that to the more knowledgeable people on the Forum.
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