I assume you need a case too and I also assume you are trying to stay under $600 so you were on the right track.
PCPartPicker part list:
http://pcpartpicker.com/p/3GWsA
Price breakdown by merchant: http://pcpartpicker.com/p/3GWsA/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3GWsA/benchmarks/
CPU: AMD Athlon X4 760K 3.8GHz Quad-Core Processor ($84.74 @ Amazon)
Motherboard: MSI A78M-E35 Micro ATX FM2+ Motherboard ($59.99 @ Amazon)
Memory: Crucial Ballistix Sport 4GB (1 x 4GB) DDR3-1600 Memory ($42.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($56.98 @ OutletPC)
Video Card: EVGA GeForce GTX 750 Ti 2GB FTW ACX Video Card ($169.99 @ Newegg)
Case: Cougar Solution (Black) ATX Mid Tower Case ($37.99 @ Mwave)
Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($34.99 @ Micro Center)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $597.63
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-09 17:06 EDT-0400)
$30 more gets you an i3
PCPartPicker part list:
http://pcpartpicker.com/p/3GWxJ
Price breakdown by merchant: http://pcpartpicker.com/p/3GWxJ/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3GWxJ/benchmarks/
CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($119.97 @ OutletPC)
Motherboard: Gigabyte GA-B85M-D2V Micro ATX LGA1150 Motherboard ($57.79 @ Amazon)
Memory: Crucial Ballistix Sport 4GB (1 x 4GB) DDR3-1600 Memory ($42.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($56.98 @ OutletPC)
Video Card: EVGA GeForce GTX 750 Ti 2GB FTW ACX Video Card ($169.99 @ Newegg)
Case: Cougar Solution (Black) ATX Mid Tower Case ($37.99 @ Mwave)
Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($34.99 @ Micro Center)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $630.66
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-09 17:09 EDT-0400)