For those using PowerStrip in Vista to resolve the color issue it's a good idea not to rely on subjective impressions what the screen looks like when displaying your desktop or what-have-you before concluding that it is "perfect".
You must look at a full spectrum of colors, a gamut or granger rainbow to ensure that there are no banding issues, no posterization, no 'speckling' where colors appear to cycle in a small area of the display, and that all the colors are being displayed with full color depth.
I previously posted a granger rainbow on
page 31 of this thread. Go look at it! (Scroll down to near the bottom.) And compare it with some other display, on another computer, preferably one you know to be high quality.
(It will also be helpful to look at this image within Mac OS with your new 15.4" WUXGA display and compare it to an unmodified MacBook Pro showing the same image. You might notice some differences!)
I never managed to get a satisfactory resolution of the color issue in Vista by tweaking display frequencies using PowerStrip, as seen when testing the display with this image, and I have given up and now run Windows within Mac OS using VMware Fusion.
And on my 15.4" WUXGA display within Mac OS, it is apparent that colors are displayed very well, but just not quite as well as on the original Apple display. (I am using the LG display.)
The Granger Rainbow test, by the way, is a very tough test! So do not be too despondent if your display is now revealed not to be 100% "perfect"!