Not sure about "best", I only know I am using a NUC7i5 with the ROCK operating system (provided for free by Roon) housed in Akasa Newton S7 Fanless case for 7th Generation Intel NUC Boards. It was challenging building, but fun and if you can follow instructions very doable. If it looks too hard then Nucleus (same operating system and uses a NUC) essentially does this for you. I am not looking back (totally satisfied), just a solid utility (just need to turn it on) that works really well; around $600 all in. https://kb.roonlabs.com/ROCK:_Getting_Started