If you want to keep your cost down buy a used 680 off the FS forum here and go SLI. A 780 would be a decent upgrade in speed, but it does come at a cost and only you know if $650 is too much in this instance. You could sell the 680 and put that towards a 780 and it lessens the blow.
Let me know Jaydip, I was going to get a 1440p catleap - actually what I really wanted was the 2560x1080 screen but they're $200 more than the catleaps - however that makes sense!
I am not a eye candy maniac but like to enable them if I can 🙂 so I guess I have to forget AA settings mostly unless its fxaa?
Half the games will run at 1440p and half at 1080p. To run most games at 1440p no msaa you will need a Titan or 690 at least, I would prefer Titan. Even then many games won't run at 1440p even without AA. This includes the likes of Crysis 2, Crysis 3, tomb raider etc.
Isn't that a bit extreme? it's almost unbelievable that even Titan can't run crysis 2,crysis 3 and TR in 1440P.