Put the screen on its AdobeRGB preset, set OSX to AdobeRGB, turn on ambient light sensor (or both to sRGB if it is too saturated for you) and leave the Spectraview in the box.
If you don't like how NEC put it up in the factory after one month, try to do it better yourself, but it will be a real pain with a much more fault-sensitive workflow. With the latest and awesome displays from Eizo and Nec, I stopped calibrating and life became much easier.
One example:
the screen has a 14-bit 3D lut. If you know what is capable with that, you DON'T WANT YOUR VIDEOCARD to mess with anything (8-bit 2D lut with banding if you set it on anything but its standard curves).
2 problems with non-calibrating (non issues though)
- My whitepoint can go afloat over time. It is 6500 out the box, but the screen can get a little more magenta or yellow over time as the backlight ages. Your eyes will compensate for it. It is way LESS colorshift than a normal day will bring through your windows. Even in a TL-lit room with daylight tubes, the variation of the tubes is similar to the screen. Are you calibrating your tubes?
- The visibility of shadow details might not be perfect. If you work in a dark room, with fixed lights, you can get a better result on your gamma-curve with a meter. If your light varies throughout the day, as in a random room with a window, the built in ambient light sensor will deliver better work than the fixed result your meter will deliver for just the light condition at the moment of measurement.