My extremely optimized audio network (Naim Uniti Core with Streaming Bridge Lumin U1 Mini plus Converter Weiss DAC 204, powered by Ferrum Hypsos Hybrid LPS
Nice and expensive equipment, but I think you could immediately do better by replacing the U1 Mini with its higher-end sibling, the U2 Mini (or better unit), and possibly upgrading the storage device inside the Naim Uniti Core. If the storage inside the NUC is a 3.5" HDD, replacing it with an SSD should yield noticeably better sound quality.

