I have a rather specific set of requirements and am just looking for a bit of advice to narrow down my search a bit.
Essentially, I am looking for a device to install LibreELEC onto, to which I will attach a USB HD with all of my music and video files on it. This device needs to have an optical out so that I can attach it directly to my stereo (with its DAC) and then use a mobile, Kodi-controller application to run it as a headless system there. I would then also intend to use Kodi's server capabilities to serve my video files from this device over my network to the Kodi I have installed on my Fire TV Stick.
I would like to achieve this as cheaply as possible, but neither do I want to take shortcuts that are just going to frustrate me and/or require an upgrade in a year or so. I've budgeted around $150 for this, but if there is a device that will function well for less than that I'm all ears. Conversely, if that is unrealistically low, please let me know.