Best is subjective to some extent. It is an IPS panel so its better then most monitors that are TN panels. IPS panels offer greater color depth and range, as well as better viewing angles.
Some people can't stand glossy displays for editing others swear by them, I personally in the second group. Their are a couple companies that sell IPS screens as well NIC sells really good budget displays they are basically re branded Lacie displays that sell for less. Dells top end IPS panels are good too. Then theirs the upper end of the scale with Eizo, many of their monitors sell for over $2000 so thats not always an option.
One thing you must take into account is that almost no displays come calibrated and even if they do monitors color slowly drifts and needs recalibrating every now and then. So you must buy a color calibrator for the most accurate color. Some higher end monitors come with them. I can personally recommend the Spyder series by data color.
http://www.amazon.com/gp/product/B0...=1789&creative=390957&creativeASIN=B004R5SLJG
This is the cheapest IPS I found which should work fine. Just make sure you turn off the "picture enhancers" like Splendid and dynamic contrast as these actually will hurt the image quality when your aiming for reference quality.
You will also want a color calibrator like the Spyder 3 pro found here http://www.amazon.com/Datacolor-DC-...58L4/ref=sr_1_1?ie=UTF8&qid=1318297172&sr=8-1
As far as I can find the cheapest 2k resolution IPS screen is the Apple cinema Display which is overall just much better but the top option is good if your on a strict budget.
Apples is not 1920 that was the older version the new one is 2560x1440 also I don't believe that the dell monitor you posted is an IPS display. Despite the fact that it has a higher res the monitor you gave me a link for will be much worse when it comes to color accuracy and therefore not good for photography.really, thank you; look great and cheap, good reviews, but I even can pay around $500 or $600 for one monitor, so any other better?
now I have this:
http://reviews.cnet.com/lcd-monitors/dell-sp2309w/4505-3174_7-33456038.html
i really like one thing about that dell, the resolution:
2,048x1,152-pixel resolution
others like apple is 1920x...