You have to differentiate between the white LED backlit monitors (Apple) and the RGB backlit monitors like the HP DreamColor. It is the monitor with individual red green and blue LEDs that produces a wider color gamut.
I have been using the HP DreamColor LP2480zx since January of this year and it is an excellent choice. Compared to the other RGB LED monitors on the market, it is relatively inexpensive ($1999) and is unique in that you can actually calibrate seven different color profiles including Full Gamut, Adobe RGB and sRGB. You can switch profiles with the push of a button. This monitor offers the widest gamut currently available. It also allows input from HDMI, VGA, DVI and display port. There were quality control issues with the production of the first line of monitors that produced uneven color. I did have to return the first monitor I purchased but the replacement was perfect. I would not hesitate to recommend this monitor.