Since color accuracy is very important in your perfession I recommend not going for those cheaper LCDs since they are most likely 6-bit LCDs. 8-bit LCDs are what you are looking for.
6-bit LCDs - Cheaper, faster response rates (usually lower than 8ms), but prone to have lots of color inaccuracies and image artifacts. These monitors uses 6 bits of data to represents each color of blue, green and red. That means this type of monitor can produce 64 shades of each color (64 = 2^6). This translates to a total of 262,144 actual colors (64^3; or 64 x 64 x 64). That's not a lot of colors to work with. Interpolation is the process used to increase the number of colors that the LCD can show on the screen. Interpolation is basically a way to mathematical "guess" what a color should be. Since guessing is not 100% accurate this can lead to discoloration and artifacts. Some manufactures lists the number of colors at 16.2 million instead of 16.7 million for the 8-bit LCD monitors. But some manufacturers list this 6-bit LCDs as being capable of producing 16.7 million colors. Thus, blurring the line can tricking some consumers into thinking the monitor is better than it actually is.
8-bit LCDs - These monitors are more expensive than their 6-bit counterparts, and have typically slower response times (8ms or higher), but they have better color accuracy. These monitors can truly reproduce 16.7 million colors. Since 8 bits of data is used to represents blue, green and red, 256 shades of each color is possible (256 = 2^8 ). This translates to 16.7 million colors (256^3; or 256 x 256 x 256).
Eizo produces a line of professional LCD screen specifically for people in the graphic profession. These LCDs are sometime referenced as being capable of producing 10-bit colors which translates to 1024 shades of each color and can potentially reproduce about 1.07 billion colors. However, these are not true "10-bit monitors" and they are still listed as being capable of producing 16.7 million colors. These are 8-bt LCDs and I believe they use a bulit-in look up table to provide more color accuracy (different from the interpolation process). Needless to say, these are expensive monitors; generally in excess of $1,400.
I have no experience with Apple LCDs, nor have I done any research on them.