PCPartPicker part list:
http://pcpartpicker.com/p/2gymf
Price breakdown by merchant: http://pcpartpicker.com/p/2gymf/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2gymf/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Newegg)
Motherboard: ASRock 970 Extreme3 R2.0 ATX AM3+ Motherboard ($69.99 @ Newegg)
Storage: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: MSI Radeon HD 7850 2GB Video Card ($127.55 @ Newegg)
Case: Rosewill Challenger-U3 ATX Mid Tower Case ($24.99 @ Newegg)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($24.99 @ Newegg)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($82.99 @ NCIX US)
Other: G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 ($49.00)
Total: $559.47
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-07 14:05 EST-0500)
NOTES ::
1) The G Skill memory on the bottom list is on sale on NewEgg. Do yourself a favor and purchase it now. $50 for 8GB memory is CHEAP especially @ 1600 DDR3.
Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314 (Buy quick. RAM will fit in any mobo. This will go out of stock soon)
2) If you're looking to game, get the 7850. I chose the MSI as it is the cheapest. You can optionally go for the 7770, but it'll only save you $20 or so.
3) The AsRock Extreme3 2.0 is on sale right now. Again, buy it. Quality Mobo for sale price. It has a 970 (970 or higher is fine) chipset, which is recommended for the AMD FX series.
4) Upgraded the case, but not 100% necessary. Though with AMD 6-core processor, and using the stock cooler, I suggest a case with good cooling. Rosewill cases are king at stock cooling. This case comes with many fans pre-installed.
5) The optical drive is cheap and on sale with free shipping. Buy this now too; as whatever build you choose, an optical drive will fit in any case.