If you like maximum detail another 770 will help, adding another 770 wont quite double fps but pretty close. At 1080p you should be fine with 2gb of vram also.

zer0-cool
Hrmmm so it's sounds like another 770 would only yield like 20-30 more FPS, almost not worth it. Also, I'm not too familiar with how SLI VRAM works, but since ill have 2x 2GB cards, would that mean 4GB VRAM or still just 2GB?

Thanks.

You will still have 2GB only.

For better understanding. These pics will show you the fps on single 770 and dual sli 770: 
 


 
 

that will depend on many factors: such as the games you play, AA setting you run at, the framerate you want to be playable, etc
 
I run a single GTX 770 at 1920x1080 and it will play just about anything for the most part at 60fps constant, but I do dip down to the 30 - 40fps range in some demanding situations in certain games such as Borderlands 2 for example cause that game is loaded with PhysX effects.
 
Metro 2033 and metro last light are also demanding on performance for the same reason, lots of Physics and PhysX effects.
 

McMada
At 1080p you should be fine with 2gb of vram also.

 
I disagree, I recommend getting a 4GB card cause thier is some games that will go past 2GB at 1080p, I was hitting 2.3GB VRAM in certain games back when I had my 2.56GB GTX 570

2.3GB VRAM?! What game used that? BF3 max settings using all ULTRA and highest AA only uses 1.2-1.5GB VRAM

Also I only plan to play BF4 when it's out at 1920x1080 ultra highest AA.

Honestly I hate playing at 60fps it's horrible! I can't play unless its 80+ fps I can totally feel at a disadvantage running 60fps; it feels too slow movement and reaction time wise.

YES