If you know/are willing to learn how to overclock(easy), this great low budget build will save you a lot of money. The build is fantastic $/performance for WoW.
The CPU in this build easily OC to around 4.4GHz on stock fan and performs on par with i5 6600 with that clock speed. And because WoW is only using 1-1.5 cores it doesn't matter that it's only a dual core CPU.
PCPartPicker part list:
http://pcpartpicker.com/list/8XgWBm
Price breakdown by merchant:
http://pcpartpicker.com/list/8XgWBm/by_merchant/
CPU: Intel Pentium G3258 3.2GHz Dual-Core Processor ($64.99 @ NCIX US)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard ($42.98 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($33.49 @ NCIX US)
Total: $141.46
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-07-17 19:17 EDT-0400