+me on using a NUC
They are a great no fuss option and easy to configure or expand. Use them in all kinds of ways in work as they a great low-footprint option on the shop-floor and training room.
If you using Windows, that's what I would look at.
+me on using a Mac Mini
I use an older (2010) Macbook Pro at home but I'm pretty agnostic as far as platforms are concerned, have used them all to some extent (and still do).
I agree that slightly older Mac models can be a real bargain as they are more open to 'upgrade' than the newer models, a nice little Macmini would also serve you very well indeed.
you won't go wrong with either of these options...
A mainly digital setup with a musical amplifier and endearing 1970's speakers. A CD player that hardly ever gets used and a turntable that is good enough to remind my how enjoyable my old vinyl is. Some cables and things.