Why do you want to use an i5 or i7? Fx 8320 is much powerful when it comes to multithreaded tasks.
My suggestion:
FX 8320 (8600)
Asus M5A97 EVO R2.0 (8100)
Kingston hyperX Blu 1600 MHz 4 GB x2 (4800)
WD Blue 500 GB (4000)
Sapphire HD7750 (7200)
Antec VP550P (3600)
Bitfenix Mer Alpha (3000)...