Nvidia side, A 680/770 or higher i would recommend. AMD side, 7970 or 7970ghz.
To be honest i wouldnt go 1440p unless I had a 780, main reason being that in some games even at 1080p a single 780 when using absolute max game settings, can drop below 60 FPS. But for GW2 a 770 or 7970ghz will be fine.
Keep in mind though, if u havnt gone 1440p yet on ur monitor, that in early 2014 Asus will have their 39" 4k monitor coming out and it ‘should’ be relativly cheap for what it is ~$1000 (much cheaper than their 31.5" IGZO 4k one atleast). And tbh if any1 is still on 1080p like myself, it will deffiantly be worth waiting on upgrading ur VDU till 4k is out at more reasonable prices. Then ofc you will need at minimum a GTX 780, recommended 2 in SLI.
Its expensive but 4k is to die for113PPI at 39" size is just mmmmm.sooo nice.
1440p and 1600p will still be running for a long time, 4k is only right now on its way, and to get playable framerates you need 2 titans atm, even the next gen cards GTX8xx and HD8xxx will struggle with 4k.
My system, right now, with a single GTX 770 is running every game at max settings (no AA, not necessary at this resolution, or at least the visual quality difference is so small it doesn’t really matter) with no problems. I am playing Tomb Raider, Metro Last Light, GW2, AC III, Bioshock Inf, BF3, The Witcher 2… I can see it maybe starting to hiccup with one or two of the games coming out next year, but not before.
Edit: Forgot to mention, this is all playing out at around 60 FPS, I was coming from GTX 660 SLI and I definitely felt a huge gain, also the general temps of my pc has gone down, so im very happy.
