Some brave soul had to have eaten the first oyster! I hope you catch my meaning but to be clear somebody- maybe you -has to try it, and then tell others about it. That is, if you get no responses here or elsewhere.
Over on Audio Asylum I have read some posts some months back, by a guy who did try a lab power supply. It was from Germany I believe, He thought it was the best power supply he had ever come across. See if you can do a search of the Amp or general asylums, I just can't remember the name. It wasn't inexpensive like the ones you have mentioned, so it may cost a lot no matter what, if you want high quality.