If you have no colorimeter and calibration software, another tool you can play with to balance colors could be QuickGamma. Obviously it's not a proper calibration but may be useful.
Read more about image quality setting here.
All mentioned above could be labeled as “subjective observations” if … if…if I did not have a reference monitor next to our test model. But it’s here, next to the Dell 2408.
It goes without saying that the NEC 2490 has none of the issues mentioned above.