For photo and video editing, I would suggest that colour accuracy is more important than the difference between 1440p and 4K resolution levels - depending on expected screen size. Also, given that photo and video editing also involve extended sessions staring at a monitor, I would also suggest that a monitor that has a more natural presentation would cause less eye-strain and allow you to keep going with longer sessions.
In addition to these, one also needs to consider the knock-on implications of going for 4K resolution levels - specifically on your graphics card. To drive 4K resolution monitors, you will need at least a GTX970 or better. Although you make no specific mention of any gaming usage, if you also want to use this rig for intensive FPS gaming on 4K at decent frame rates, be prepared to spend big money for something like a GTX980ti.
You do not mention the size requirement for this new monitor - I would suggest you're probably wanting something around 27" diagonal.
So, if we summarise these "derived specifications":
Size: 27"
Aspect Ratio: 16x9
Resolution: 2560x1440
Colour Bit Depth: 10-bit (~1 billion colours)
Colour Calibrated: Yes - at factory with calibration certificate
Colour Gamut: As close to 100% of Adobe RGB as possible
Ergonomics: Adjustable for Tilt, Swivel, Rotate and Height
Editing aids: Grid and page-size overlays from monitor buttons
Video Inputs: HDMI, DisplayPort, DVI-D
Then one monitor comes to mind:
https://www.asus.com/Commercial-Monitors/PA279Q/
The Asus PA279Q ticks virtually all of these boxes (it does not support GSynch, but that's more critical for gaming than for photo/video editing).
I've had mine for just over a year now and would not change it for any 4K monitor I've seen so far.
It is not a low-cost monitor by any means but is very well constructed and the mounting pillar is robust and solid with excellent ergonomic adjustment options. The picture quality is one of the best I've seen with really accurate and easy-on-the-eye colour rendition (The Pentax Gallery images snap into life in front of you), excellent off-axis colour performance with almost no change in horizontal viewing at up >175 degrees, and a maximum brightness that is higher than most (allowing a wider dynamic range to better reproduce darker detail).
It is also worth investing in a screen calibrator (I use a Spyder3) as the factory calibration is fine BUT only sets the monitor settings and NOT your on-board video driver settings. The calibrator will allow you ensure that BOTH monitor and driver settings are complementary and you will achieve the best image quality by avoiding conflicting settings between monitor and driver.
Finally, at 27" diagonal, 1440p is fine but if you're looking to go bigger than 27", you may want to consider 4K but also look around very carefully for a monitor that ticks the same set of boxes listed above (and be prepared to ask your bank manager for a mortgage to pay for it...
)
And here's a link to a YouTube video clip of unboxing and overview (Linus TechTips):
https://www.youtube.com/watch?v=QSiSMr3BpJ0
I hope that helps...
Dave
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