I have a very devilish update!
This evening I just called up DELL and ask them to take back my 2407 for a full refund (But i must pay $35 for the shipping.) Because I really cannot tahan the color and brightness anymore. I'm having headache everyday for the past few days since I got the monitor. I've calibrated for more than 5 times over 2 days but the color are really way off.
Just a few hours ago, I went to the Apple shop and get a Cinema Display 20"!!! Now it feels much better. The viewing angle is better than Dell, at least the blacks don't lose their contrast when I shift to my sides.. Colors are more accurate even at factory default. Words appear sharper too - I can move further away from the screen and still see the words I'm typing Now I'm warming the monitor up and going to calibrate it later.
Not saying the Dell is not good, but a side by side comparison, the Apple is even better