Thought I would add my PSU upgrade experience to this thread...

I have a G68 with a variety of mods, including a modded PSU. I hired a local modder to do the work. He started with a Condor SMPS and added new caps and rectifier. The results were increased resolution, decreased high frequency harshness, and better dynamics.

He also changed the clock and the op amps, so strictly speaking, I can't say how much of the improvement was attributable to the new PSU. But the overall effect was a dramatic improvement.

Here are the G68 Modified PSU Photos

Bryon

iMac -> Sonos -> Empirical Audio reclocker -> G68 (modded) -> Pass Labs XA30.5 amp -> Focal 1027be speakers + JL Audio F113 sub. Pioneer Elite PRO 151FD 60" display.

G68 mods... Custom power supply, Audiocom Superclock 4, Rubycon capacitors, WBT Nextgen connectors, ultra low noise op amps, analog output buffer, DSPC c00044, Revelation One filter.