I would suggest a slightly different build.
Motherboard: ASUS M5A97 R2.0 AM3+ AMD 970
- If you are going for an AM3+ CPU, you should get an AMD 900 series chipset as they are designed for these fairly new processors. The non-AMD 900 series does have compatibility but not the ability to use some of the newer power features of AM3+. $94
CPU: AMD FX-6300 Vishera 3.5GHz
or AMD FX-8320 Vishera 3.5GHz
- These are six and eight "core" parts. The reason I suggest these is because of the workload and the CPU design. The FX parts are unique in their architecture. They have two tightly bound cores that share certain resources. Unless the program is optimized to use the chip efficiently, it will view each of the cores as independent when they are only semi-independent. So, the FX-4000 series doesn't function, nor has it the same performance, as many true quad core parts. Programs that value physical cores, like Handbrake, do very well with the FX series of CPU's. This is why the FX-8000 and FX-6000 series will offer a greater benefit. $139 and $179 respectively.
I also suggest Windows 8 as that operating system is designed to use the unusual architecture of FX a little more efficiently than Windows 7.