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Like Mr. Joe, I ended up using BasICColor Display (which shares a history w/ the ColorEyes) to achieve the same thing. Then I got an NEC external monitor.
Just as an additional datapoint, the way BasICColor does that is not magic. It just lowers the white point (think PS Curves upper-right corner) downwards. That has the unfortunate side effect of lowering the range between black and white. Taht was one of the reasons I now do my PS work on the NEC and leave the palettes on the iMac screen. They're fairly close (after lots of trial and error in calibration tweaking the XY white points)