My current system is an Amd Fx4100 quad core at 4.2GHz with an fx3850 amd chip type. I have 8gb ram and a terabyte disc drive. I have the Geeforce GTX 560 1GB HDD and my psu is a 500w coolermaster. I'm hoping to get a new Cpu good enough to run next gen at comfortable fps on medium i have around $180 to spend any recommendations?