I had the same question 2 or 3 years ago. My experience was surprisingly negative.
At that time, mass-market LCDs were made for games and videos, not high-quality color applications. One of the main problems was that color fidelity was being degraded in order to decrease screen update times. Advertisements competed for the lowest refresh rates, 2 milliseconds or less.
When I say degraded color fidelity, I mean the info I read on the web stated that 8bit RGB channels were effectively reduced to 7 or 6 bits. Whatever the cause, color spectrum test images posted to the web would show banding if data bits were lost on the viewer's display.
This was not just academic theory. After much study, I bought an NEC LCD, highly rated, good reviews, somewhat expensive. The manufacturer's data was insufficient to decide whether it could truly provide 8bit RGB channels. It did not. I found banding in the on-line test images, and far worse, false color aliasing in my own images. Fortunately I was able to return it. The NEC was not a "bad" monitor, not at all, but it was made for games and video, not at all for astro imaging.
I eventually bought a Samsung XL20, which I use today. It cost over 2X as much as the NEC. It took a long time to save enough money to pay for it. The XL20 is acceptable, but for imaging, it must be used with the settings I calibrated into it when I bought it.
However, if you search the web, you will see the XL20 is no longer made. Furthermore, there is no Win7 driver for its calibrator, so my XL20 cannot be calibrated again. I am unaware of any similar monitor currently made by Samsung.
My advice is gather as much info as you can before you buy something. Also, buy from a vendor who will allow you to return the monitor if you find it unacceptable. If all mass-market display makers have abandoned the high-quality color market, you may find prices from specialty makers to be very, very, very high.
I hope I am wrong. I still remember common CRT monitors which were better than any LCD I have ever seen, and fairly affordable.