These are some changes I would make.
CPU - AMD Phenom II X4 965 Black Edition 3.4 GHz
Motherboard - ASRock 870 Extreme3
HDD - Samsung Spinpoint F3 500 GB
GPU - EVGA GeForce GTX 460 1 GB
PSU - Corsair VX550W
Note that you can't SLI on most AMD motherboards. If you want an SLI ready motherboard then you'd want the MSI NF980-G65.
If you're overclocking then change the CPU to what you have.