ah, that's quite unlucky with the Acer XR341CK's. Although some people are complaining about the wine.
Have you had a look at Dell ultrasharps? Such as this one
http://www.newegg.com/Product/Product.aspx?Item=N82E16824260239&cm_re=dell_ultrasharp-_-24-260-239-_-Product
I personally would rather go a single high resolution ultrawide monitor, instead of 3 monitors. Unless you're happy with reduced settings at 3x1440p monitors
It's still personally up to you. With the Dell S2716DG's you were thinking of getting, If you're under 60fps G-sync should smooth it out anyway. Over 30fps should still feel smooth with Gsync.
It also depends what games you like to play.
Now you've got me wondering which would look better... I still prefer a single great monitor, 3 monitors does have good peripheral vision in FPS, but to me personally it feels more distracting. It feels amazing in 3rd person games though.
That's my thoughts.
Do you have a local store that you can go to, to see a little demo?
With the x34, after looking around at some reviews alot of people seem to be complaining about backbleed and lines when Gsync is on.