To answer your question YES - a better power supply will definitely improve the performance. The sBooster made a noticeable increase in SQ in my system -increased bass, soundstage and imaging were immediately noticed, along with increased clarity in vocals ( words to well known songs that had been uncertain before were now becoming recognizable). I got mine from Upscale Audio here in California, ~ $400. I had reservations about spending $400 on a dac that cost $550 when new, but not after it was in my system. Try it out, Upscale offers a return policy if you are not satisfied. Order it specifically for the DacMagic Plus and it will come with the necessary adapter.
My system: Sony C222ES to DacMagic to Rogue Pharaoh to Martin Logan Montis via Black Cat coax, Darwin Ascension + and Goertz Veracity cabling, respectively
My system: Sony C222ES to DacMagic to Rogue Pharaoh to Martin Logan Montis via Black Cat coax, Darwin Ascension + and Goertz Veracity cabling, respectively