Which 1440p monitor as part of a triple monitor professional setup

[embeddedbob]

... allowing for the possibility of gaming (easiest way to describe requirements on here)

I have 2x19" monitors (1900x1280) from years ago and I want to add in a 28" 1440p monitor, but which one?

https://www.overclockers.co.uk/showproduct.php?prodid=MO-206-SA&groupid=17&catid=1120
https://www.overclockers.co.uk/showproduct.php?prodid=MO-070-AC&groupid=17&catid=1120
https://www.overclockers.co.uk/showproduct.php?prodid=MO-077-AS&groupid=17&catid=1120
https://www.overclockers.co.uk/showproduct.php?prodid=MO-105-BQ&groupid=17&catid=1120
https://www.overclockers.co.uk/showproduct.php?prodid=MO-080-DE&groupid=17&catid=1120

Are monitors, such as...
https://www.overclockers.co.uk/showproduct.php?prodid=MO-083-AS&groupid=17&catid=1120

really worth the extra money? Not sure I need the freesync...

I also need to upgrade the graphics card and as I do some 3d work, ill probably get a reference designed 970 such as: https://www.overclockers.co.uk/showproduct.php?prodid=GX-205-OK to drive all 3 monitors.

(Although I presume the dremal will be required as its an SG05 silverstone case - will check before buying).