I didn't know if you wanted to overclock so I didn't list an overclockable processor. It will definitely play those games on high as its video card is really powerful.
PCPartPicker part list:
http://pcpartpicker.com/p/taei
Price breakdown by merchant: http://pcpartpicker.com/p/taei/by_merchant/
Benchmarks: http://pcpartpicker.com/p/taei/benchmarks/
CPU: Intel Core i5-3470 3.2GHz Quad-Core Processor ($149.99 @ Microcenter)
Motherboard: ASRock H77 Pro4/MVP ATX LGA1155 Motherboard ($87.55 @ Newegg)
Memory: Patriot Intel Extreme Master, Limited Ed 8GB (2 x 4GB) DDR3-1600 Memory ($31.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($67.99 @ NCIX US)
Video Card: Sapphire Radeon HD 7950 3GB Video Card ($279.99 @ Newegg)
Case: Antec Three Hundred Two ATX Mid Tower Case ($59.71 @ NCIX US)
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($49.99 @ NCIX US)
Optical Drive: Lite-On IHAS324-98 DVD/CD Writer ($14.99 @ Newegg)
Total: $742.20
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-18 21:56 EST-0500)