A few things I'd change:
change to a quad core intel CPU such as the i5 3570K. it'll be faster than your planned AMD CPU and is cheaper too!
I'd recommend spending the money you saved with your CPU/motherboard change on your graphics card, as this will be the bottleneck of your system when gaming.
you could also downsize the power supply, I'd get a decent quality 550-650W power supply.
Okay thank you. You said use the money for a better graphic card. What craphic card would you recomend me?