Im looking to maybe upgrade my PC and as i have limited knowledge in regards of computer hardware im looking for some advice on what to get and what to keep.

What i have now:

CPU Intel core i5-3570K CPU 3.40GHz
RAM Corsair Vengeance 2133 MHz 2x4GB
GPU NVIDIA GeForce GTX 660
Motherboard MS-7758

Also got SSD drive for my system files and games.

im looking to be able to play the new watchdogs game smoothly on minimum graphics ( higher graphics is ofc nice but not going to spend money on a better graphics card if its not needed ) and multibox 8+ eve clients on minimum settings ( the more the better )

Any help is appreciated, maybe ill even throw a bunch of geckos at someone as a thanks