This is something I've been looking into recently. I bought a similar ASUS (ASUS VW246H) just a couple weeks ago. Its OK. I know now that I will never own a monitor smaller than 24 inches. I'm use my computer primarily for video editing so I'm looking for something with more accurate colors which means IPS technology.
What you have to keep in mind when youre reading reviews on the best monitor is that they are comparing TFT monitors which while they are affordable, they are the worst when it comes to the best image quality. Most people want a space saving flat screen thats really big while still being affordable. That means TFT screens. Since thats what most people want, thats what gets reviewed, but to say they are the best monitors or that the image quality is really good, is inaccurate. Its more like they are the best among the worst.
What I've found is that if the NEC LCD260W2 ($1400) isn't the best monitor, its probably among the top three. Lacie makes high end monitors too, but for considerably more. Dell makes an IPS monitor called the Doublesight, around $525 for a 24 incher, but I can't seem to get any solid feedback on it. Does anyone know? I would love to pay under $600 for an ISP monitor but not at the expense of half the quality and I know Dell has a rep for selling ISP monitors with TFT screens. This price seems almost to good to be true. I'd also like to know more about the HP DreamColor.