PCPartPicker part list:
http://pcpartpicker.com/p/tPCcFT
Price breakdown by merchant: http://pcpartpicker.com/p/tPCcFT/by_merchant/
CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($105.75 @ OutletPC)
Motherboard: ASRock H97M Anniversary Micro ATX LGA1150 Motherboard ($66.99 @ SuperBiiz)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($51.88 @ OutletPC)
Video Card: Gigabyte Radeon R9 270 2GB WINDFORCE Video Card ($144.99 @ Newegg)
Case: Antec GX500 ATX Mid Tower Case ($24.99 @ Newegg)
Power Supply: Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply ($39.99 @ Newegg)
Total: $434.59
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-01-23 06:15 EST-0500
I left out RAM as 4gb is enough, 8GB isn't required right off the bat but it's a good upgrade for the future.