PCPartPicker part list:
http://nz.pcpartpicker.com/p/3aCmP
Price breakdown by merchant: http://nz.pcpartpicker.com/p/3aCmP/by_merchant/
Benchmarks: http://nz.pcpartpicker.com/p/3aCmP/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($159.95 @ Computer Lounge)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard ($155.24 @ PB Technologies)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1600 Memory ($113.85 @ PB Technologies)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($87.98 @ Aquila Technology)
Video Card: Sapphire Radeon R9 270X 2GB Video Card ($320.84 @ PB Technologies)
Case: Antec One ATX Mid Tower Case ($88.21 @ Aquila Technology)
Power Supply: Antec High Current Gamer 520W 80+ Bronze Certified ATX Power Supply ($118.11 @ Aquila Technology)
Optical Drive: LG GH24NS95 DVD/CD Writer ($40.24 @ PB Technologies)
Monitor: AOC E2260SWDN 60Hz 21.5" Monitor ($167.44 @ Aquila Technology)
Total: $1251.86
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-16 16:56 NZDT+1300)
Your build is quite solid, it will be able to play those games quite well. I just changed the PSU.