Those are both TN panels, so you should not get either one of them.
For image editing and any type of work where you want proper colors on-screen, then I suggest getting either an IPS or PLS type monitor (or maybe an AHVA).
About TN panels
Most monitors use a TN panel (like the two you mentioned). TN panels have worse viewing angles and will result in colors getting worse at any slight angles. Whites will turn brownish if you increase the angle enough. Also, since the corners of the screen are at a different angle to your eye than the center of the screen, that means the colors in the corner of the screen will be a slightly different color than in the center of your screen (something that people who do image editing might notice).
Now, that you know about panel type. Look for an IPS or PLS (and maybe AHVA) monitor and then consider these other factors:
* matte vs glossy: Do you want a highly reflective screen or a matte (sandy/rough) looking finish? The glossy screens have great colors, but can often give you headaches with all the glare it causes. Many people choose matte because of the glare issue.
* 16:9 vs 16:10 -- Many monitors are 1920x1080 (16:9 ratio). However, another popular size is the 1920x1200 (16:10 ratio), which gives you extra vertical space to work with. This extra vertical space costs more, but is very useful when you do productive work on a computer (like you are doing).
* resolution / screen size -- If you get a 27" monitor with a 1920x1080 resolution, chance are that you will begin to notice the bigger pixels. The screen will have this black grid (like a screen door). For a 27" monitor, the ideal resolution is around 2560x1440. For 1920x1080 or 1920x1200 the max recommend resolution is usually a 24" or 23" so the screen door effect is not as noticeable.
However, to be fair, even at 27" on a 1920x1080 screen, the "screen door" effect is not that bad. I suggest that you check out one in the store... because if it looks ok for you then, the 27" 1080p offers a really cheap option for a large screen size.
So, here's my recommendations:
A general list of IPS and PLS panels you can pick from:
http://www.newegg.com/Product/ProductList.aspx?Submit=P...
And, here's some narrowed down results....
Currently, the only ones within your price range are the 1920x1080, however, do give the 1920x1200 some consideration before you make a final purchase.
24" 1920x1080 [16:9] IPS/PLS ($150+):
http://www.newegg.com/Product/ProductList.aspx?Submit=P...
24" 1920x1200 [16:10] IPS/PLS ($200-250+):
http://www.newegg.com/Product/ProductList.aspx?Submit=P...
27" 1920x1080 [16:9] IPS/PLS ($230+):
http://www.newegg.com/Product/ProductList.aspx?Submit=P...
27" 2560x1440 [16:9] IPS/PLS ($300 noname / $500 namebrand):
http://www.newegg.com/Product/ProductList.aspx?Submit=P...
30" 2560x1600 [16:10] IPS/PLS ($500 noname / $1,000 namebrand)
http://www.newegg.com/Product/ProductList.aspx?Submit=P...)
Lastly here's another option you might want to consider:
IPS/PLS panels that run at 96Hz or 120Hz, like this one:
PLS 27" 2560x1440 [16:9] 96 or 120Hz (~$360)
matte
glossy