Photographer looking for a flat screen monitor to edit pictures?

My father is a wedding photographer, but right now we only have a laptop to work with when editing pictures. Basically, the screen isn't working for us, it doesn't calibrate correctly. I'm looking for a flat screen monitor for him to use. I picked out these four (on Amazon), but I'm not sure which one would work best. Any suggestions? I'm not worried about the price of these, just quality.

Viewsonic's VA2448M-LED 24-Inch Widescreen LED Monitor
http://www.amazon.com/...004KCPH84/

Viewsonic VX2450WM-LED 24-Inch (23.6-Inch Vis) Widescreen LED Monitor with Full HD 1080p and Speakers
http://www.amazon.com/...003Y3BJ7S/

ViewSonic VA2406M-LED 24-Inch Screen LED-Lit Monitor
http://www.amazon.com/...009F1K79Y/

Asus VS247H-P 24-Inch Full-HD LED-Lit Monitor
http://www.amazon.com/...005BZNDS0/

Thanks so much!

Added (1). I guess since the Viewsonics are all very similar, which would you prefer? Asus or Viewsonic?

Look for a monitor that has a colour gamut of AdobeRGB.

There are only a few and most are rather expensive.

These are the top of the line monitors.

http://www.eizo.com/global/products/coloredge/index.html

More affordable monitors

http://spectraview.nec.com.au/products/details/23/

http://accessories.us.dell.com/sna/productdetail.aspx?c=us&cs=04&l=en&sku=225-4148

http://www.dpreview.com/...ergb-gamut

In the end, you will need a monitor calibration and profiling device to assure accurate colour management of your images

Xrite makes two as does Panatone.

EDIT: As a minimum, you will want a monitor that produces sRGB colour work space

Of the four listed, the first Viewsonic 24-Inch Widescreen LED Monitor, maybe best choice,
the one with sound not needed, if you have other webcam and video services,

There are other types of monitors, but it depends on price range limit,
http://www.amazon.com/...zon.com/s/

Eizo CG series
http://www.eizo.com/global/solutions/graphics/index.html

ViewSonic Graphic Series
http://www1.viewsonic.com/products/desktop-monitors/lcd/graphic-series/

Dell UltraSharp
http://www.dell.com/...rpmonitors

ASUS LED-Lit IPS
http://www.asus.com/..._Products/

NEC P Series monitors
http://www.necdisplay.com/category/desktop-monitors

Samsung SyncMaster
http://www.samsung.com/...r/monitors

http://www.bhphotovideo.com/...4294542210
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