Need a GPU..

[what3ver]

Hi, My current set up is:

ASUS M4A78 Pro
AMD Phenom 8650 x3 2.3GHz
Nvidia GeForce GTX 260
6GB ram

It's an old set up, and would like to increase performance in games. The GPU i believe is whats holding me back, as the RAM and CPU are still okay-ish.

I don't mind spending 200-300 pounds on a new GPU. Hopefully that can get me a compatible upgrade.. But i don't know much about GPUS so can you help me?
I would hope it would let me play the new BF4/GTA games.

I'm also upgrading CPU in the near future.

 

[PyjamasCat]

What is your current monitor setup? If your running a single display, it might be your CPU, but a GPU upgrade would be good too if you want to have DX11 support.