Here you go:
PCPartPicker part list: http://pcpartpicker.com/p/sFRxxr
Price breakdown by merchant: http://pcpartpicker.com/p/sFRxxr/by_merchant/
CPU: AMD Athlon X4 760K 3.8GHz Quad-Core Processor ($89.99 @ Newegg)
Motherboard: Gigabyte GA-F2A55M-HD2 Micro ATX FM2 Motherboard ($45.37 @ OutletPC)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($77.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($52.91 @ OutletPC)
Video Card: XFX Radeon R9 270 2GB Double Dissipation Video Card ($150.20 @ Newegg)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($34.99 @ Micro Center)
Power Supply: Antec High Current Gamer 520W 80+ Bronze Certified Semi-Modular ATX Power Supply ($76.92 @ Amazon)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($13.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($84.98 @ OutletPC)
Total: $614.34
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-08-24 06:34 EDT-0400
Will handle WoW with ease.
You will be able to play more intensive games,like Crysis 3 at medium @ 60 FPS stable.
All the best.