The Eizo 2031 is currently on sale, and although it is 20 inch, it has the same resolution as the 22 inches. It is S-PVA and very accurate sRGB out of the box with ambient light adaption. It's around 300$ now and a no brainer for photo accuracy.
The HP is an AdobeRGB gamut panel and is really hard to tame to sRGB spectrum, although it looks gorgeous, has a decent grey curve and great viewing angles.
Best option would be the Eizo 2431, a Nec 2470 or 2490 or the LaCie 324, they have the same panel as the DELL 2408, but are easier to calibrate. If you can find them at a good price....
The HP LP2275W is an S-PVA, and slightly easier to calibrate than its bigger brother.
One of the big plusses of NEC, Eizo and LaCie screens are that they are calibrated to give very accurate sRGB/AdobeRGB display when set in the user mode that goes with it. By using an ambient light sensor, back lighting is adjusted to give the perfect sRGB/AdobeRGB display in any ambient light situation, whether it is sunlight or winter darkness.
It makes life much easier as you can set your computer in the working-space colour profile, instead of a monitor profile, which keeps the work flow very straightforward. You won't need to learn all nonsense about profiling and calibrating, you don't have to calibrate each month and it won't cost you anything on crap talk in bad colour-work-flow seminars. Just get back to work and do it the easy way!
So the dollars/euro's spent on a calibration device are spent better on upgrading to these 3 brands!
And don't worry about that last 1 or 2 delta-E in calibration. First it is splitting hairs compared to the fluctuation in ambient light, second your eyes are as subjective as a bad politician, and compensate for everything.