I highly recommend using the NEC SpectraView II calibration software when running an NEC monitor. They are tightly integrated and calibration/profiling could not be easier and fool proof. The big difference (and this is very significant) is that SpectraView II uses the monitor LUT to build the monitor profile data instead of using the LUT of your video card. It also has direct access to the monitor controls. This will give you a much better calibration/profiling. The process is totally automated once you set the calibration parameters (target luminance, contrast, white point, etc.) you want.
When I got my NEC I initially used my X-Rite i1Pro sensor and iMatch 3 software. The results were not nearly as accurate when I decided to get SpectraView II. The good news is that you can get the ColorMunki system to profile your printer/paper/ink combinations (you don't actually calibrate it, this is done at the factory) and use the ColorMunki colorimeter (sensor) with SpectraView II just like I use my i1Pro. It is fully compatible according to the NEC website here: