Quest for the Ultra-Quiet PSU

Is anyone prepared to swear by any particular unit?
I can only speak to the Corsair HX1050 Gold, and while it's quiet enough on low-load tasks, there's no mistaking it for "whisper quiet" when playing video.  Depending on background noise levels and whether audio is playing, that noise may not be noted.  By its an unmistakable engine when playing HD video in a quiet room without an audio track.  The source appears to be the PSU fan, and the sound insulation in the case doesn't appear to be much help.
How typical is this?

See the following noise curve from Newegg for the HX1050:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139034
And here is one for the new, very configurable, and pretty expensive AX1200i (I have theAX1200 which does not have the user configurable load vs. fan speed capability):
http://www.corsair.com/power-supply-units/ax-series-power-supply-units/ax1200i-digital-atx -power-supply-1200-watt-80-plus-platinum-certified-fully-modular-psu.html
So, let's say you are really pulling 450 watts.
For the AX1200i you would be at 37.5% load and from the chart, 10db (pretty darn quiet)
For your HX1050, you would be 43% loaded and from the chart at about 25db; every 3db of sound level makes a significant difference, so 15db is certainly substantial
Their charts show fan speed per load, but I'm pretty sure the fan speed is actually thermostatically controlled, so if the inlet for your p/s is getting warm air, it will be running faster for a given load.
My p/s is pulling air from underneath the case so it is the same temperature as the room. If yours is configured with the inlet from inside the case, then that air will indeed be warmer. For my Coolermaster case, I can choose which way the p/s is installed; your case may or may not allow for this mounting option.
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