My old 24" Dell IPS display has started getting weird dead pixel effects from time to time so I think it's time to relegate it to a secondary display and get a nice new primary display monitor, a lot of the graphics designers at work use 26-27" monitors and I've been kind of taken in by them. 
I do a fair bit of photographic work, so IPS is kind of a must, and I think that 1080p is about acceptable on the 24" display but would not be enough on a 27" display for me, while at the same time I game so would probably find 4k would decimate my framerate, so the 2560x1440 seems like a good res for me. No budget in particular really, I'm willing to spend what's needed.
Are there any particular favourites or is sticking with Dell again a good choice?

I do a fair bit of photographic work, so IPS is kind of a must, and I think that 1080p is about acceptable on the 24" display but would not be enough on a 27" display for me, while at the same time I game so would probably find 4k would decimate my framerate, so the 2560x1440 seems like a good res for me. No budget in particular really, I'm willing to spend what's needed.
Are there any particular favourites or is sticking with Dell again a good choice?