Battlefield 4 in 1440p... Which GPU should I get?

[legosenpai]

I was wondering which GPU to get. I have yet to build or buy my PC(except for the fan and the case), so I am open to advice. My budget is around 700 to 800ish $. Ideally, I would ideally like to play in medium to high settings, but I don't mind playing in low. Here is my current parts list.

PC Mate z79 mobo
Core i3 4150
WD 1TB Blue
NZXTcase
G Skillz Ripjaws X Series 8 GB
EVGA 500w 80 Plus Bronze
Achevia Shimian QH270 1440p IPS monitor
Current GPU: gtx 960 4g superclocked

Not planning to overclock, and heres the Pcpartpicker link:
http://pcpartpicker.com/p/4fGnVn

 

[Forgotten031511]

Good: AMD R9 290X
Good: AMD R9 390
Better: GTX 970's in SLI
BEST: GTX 980 Ti

Note, that CPU might be an issue. BF4 is very CPU dependent and i3's are not the best/fastest for gaming.