How long will this system be useful for?

PCPartPicker part list: http://pcpartpicker.com/p/1WfBx
Price breakdown by merchant: http://pcpartpicker.com/p/1WfBx/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1WfBx/benchmarks/

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($199.99 @ Amazon)
CPU Cooler: Phanteks PH-TC12DX_BK 68.5 CFM CPU Cooler ($59.99 @ Amazon)
Motherboard: Gigabyte GA-Z87X-UD3H ATX LGA1150 Motherboard ($158.98 @ OutletPC)
Memory: G.Skill Ares Series 16GB (2 x 8GB) DDR3-1866 Memory ($149.99 @ Newegg)
Storage: Sandisk Ultra Plus 256GB 2.5" Solid State Disk ($119.99 @ Amazon)
Storage: Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive ($104.99 @ NCIX US)
Video Card: EVGA GeForce GTX 780 3GB Video Card (2-Way SLI) ($499.99 @ NCIX US)
Video Card: EVGA GeForce GTX 780 3GB Video Card (2-Way SLI) ($499.99 @ NCIX US)
Case: Corsair 750D ATX Full Tower Case ($129.99 @ Micro Center)
Power Supply: Rosewill Lightning 1000W 80+ Gold Certified Semi-Modular ATX Power Supply ($181.49 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Operating System: Microsoft Windows 8 (OEM) (64-bit) ($97.98 @ OutletPC)
Total: $2223.35
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-22 09:22 EDT-0400)


PCPartPicker part list: http://pcpartpicker.com/p/1WfHv
Price breakdown by merchant: http://pcpartpicker.com/p/1WfHv/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1WfHv/benchmarks/

CPU: Intel Core i7-4930K 3.4GHz 6-Core Processor ($565.98 @ Amazon)
CPU Cooler: Phanteks PH-TC12DX_BK 68.5 CFM CPU Cooler ($59.99 @ Amazon)
Motherboard: Gigabyte GA-X79-UP4 ATX LGA2011 Motherboard ($239.99 @ SuperBiiz)
Memory: G.Skill Ares Series 16GB (2 x 8GB) DDR3-1866 Memory ($149.99 @ Newegg)
Memory: G.Skill Ares Series 16GB (2 x 8GB) DDR3-1866 Memory ($149.99 @ Newegg)
Storage: Sandisk Ultra Plus 256GB 2.5" Solid State Disk ($119.99 @ Amazon)
Storage: Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive ($104.99 @ NCIX US)
Video Card: EVGA GeForce GTX 780 3GB Video Card (2-Way SLI) ($499.99 @ NCIX US)
Video Card: EVGA GeForce GTX 780 3GB Video Card (2-Way SLI) ($499.99 @ NCIX US)
Case: Corsair 750D ATX Full Tower Case ($129.99 @ Micro Center)
Power Supply: Rosewill Lightning 1000W 80+ Gold Certified Semi-Modular ATX Power Supply ($181.49 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Operating System: Microsoft Windows 8 (OEM) (64-bit) ($97.98 @ OutletPC)
Total: $2820.34
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-22 09:23 EDT-0400)