Not sure if I'm reading the USB pass through bit right, but if it's a USB powered device, AQVox and iFi make good PSUs which normally get recommended.

If it's a straight PSU you're after, Teddy Pardo gets a lot of votes, I can personally vouch for Avondale Audio (not cheap but awesome), and Russ Andrews PowerPaks, although not linear, are extremely clean and sweet sounding IME. Lastly, Paul Hynes reputation is very good.

Without knowing any kind of reputation, e.g., on eBay, it's risky - a poor LPSU may well sound worse than the PSU which came with the director.

HC: 861v4/ID40/LPS, DSP5000, DSP5000VC, DSP3100, SW1600, HD621, Oppo BDP-105, Sony VPL-HW55ES
2-Channel: Oppo BDP-105, TEAC VRDS-7/Trichord Clock 3/PSU, 551, Quad 303, Harbeth Compact 7ES-3, Kimber cables, Russ Andrews mains and supports.
Previous Meridian: 5000C, 5200SL, 7200.2, 6000, 562V.2, 568.2mm, 800v4, 808.2i, 818v2/v3, 861v8, 502