Here's a I7 and GTX780 beast that can play anything you want at ultra settings i think
PCPartPicker part list:
http://pcpartpicker.com/p/3JWSt
Price breakdown by merchant: http://pcpartpicker.com/p/3JWSt/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3JWSt/benchmarks/
CPU: Intel Core i7-4930K 3.4GHz 6-Core Processor ($574.98 @ SuperBiiz)
CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler ($99.98 @ OutletPC)
Motherboard: Asus X79 Deluxe ATX LGA2011 Motherboard ($324.99 @ SuperBiiz)
Memory: Corsair Vengeance 16GB (4 x 4GB) DDR3-2133 Memory ($189.99 @ Amazon)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($79.99 @ Micro Center)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($83.97 @ OutletPC)
Video Card: EVGA GeForce GTX 780 3GB Superclocked ACX Video Card ($499.99 @ NCIX US)
Case: NZXT Phantom (White) ATX Full Tower Case ($99.99 @ Amazon)
Power Supply: Cooler Master GX 750W 80+ Certified Semi-Modular ATX Power Supply ($92.98 @ SuperBiiz)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($19.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Monitor: Asus VX238H-W 23.0" Monitor ($119.99 @ Newegg)
Keyboard: Cooler Master CM Storm Quick Fire TK Wired Gaming Keyboard ($79.24 @ B&H)
Mouse: Razer Taipan Wired Laser Mouse ($64.99 @ Amazon)
Total: $2421.04
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-14 13:53 EDT-0400)