What should I upgrade first

[SGuitarist]

Ive been saving for a PC upgrade for quite some time I currently have around 250 dollars to spend and would either like to upgrade to a second monitor or a GTX 660/R9 270x

I would use the second monitor for programming I'm currently taking programming/Networking courses in my high school and working on a simple indie game with some friends. I feel like I'm constantly running out of screen room. Having a compiler, a browser, and a voice chat client open to talk with my team members for the game

I also play a lot of games, I currently have a GT 640 and Honestly I've gotten used to the lag, I got it for free so I can't complain. I managed to play through BioShock Infinite at 30 fps (It was EXTREMELY pain full) 

Overall my question to the forum is which upgrade should I choose?

[Jogostar]

GPU

[X1XNobleX1X]

GPU

I second this!

[tk421]

It kinda depends on the rest of your specs but I would probably suggest a new GPU since you say you play a lot of games.  I would wait on the second monitor IMO.  Gotta love ALT + TAB! lol

[SGuitarist]

It kinda depends on the rest of your specs but I would probably suggest a new GPU since you say you play a lot of games.  I would wait on the second monitor IMO.  Gotta love ALT + TAB! lol

I have an i7 3770k 16gb of Adata ram @1600mhz  a 2TB western digital hard drive, and a 550watt XFX 80 plus certified PSU 

[SGuitarist]

Thanks Guys, I'll be going for the GPU, I just looked at some benchmarks for the 760, and damn... That's huge performance for the money! thanks to all who replied though!

[Nidiahk]

There is 270x vs 760 and they are about the same price from what i saw   http://www.anandtech.com/bench/product/1043?vs=1038