Core died, seeking deals on new/refurb hardware

[mjw (Here I am with a brain the size of a planet and they ask me to pick up a piece of paper. Call that job satisfaction? I don't.)]

I think the i3 NUC will be fine for you …

Building a ROCK system

Yes, I think so … this would be equivalent to the Nucleus. Library capacity Up to 10,000 albums (100,000 tracks) Multi-room streaming Up to 6 simultaneous zones DSP capability All DSP functions available in the PCM domain. Certain combinations of functions using DSD source or destination formats, upsampling, or multichannel processing may not be possible. You can buy the components direct from Amazon for 330GBP (8th Generation i3 NUC.) See ROCK for Small to Medium Size Library in the KB.

You can add a USB optical drive for ripping direct to your library.