PCPartPicker part list:
http://uk.pcpartpicker.com/p/RxdsBm
Price breakdown by merchant: http://uk.pcpartpicker.com/p/RxdsBm/by_merchant/
CPU: Intel Core i7-5820K 3.3GHz 6-Core Processor (£319.79 @ More Computers)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£24.99 @ Amazon UK)
Motherboard: MSI X99S SLI Plus ATX LGA2011-3 Motherboard (£156.99 @ Amazon UK)
Memory: G.Skill Ripjaws 4 series 8GB (2 x 4GB) DDR4-2400 Memory (£92.87 @ Amazon UK)
Storage: Samsung 850 EVO-Series 500GB 2.5" Solid State Drive (£161.80 @ Amazon UK)
Storage: Western Digital BLACK SERIES 3TB 3.5" 7200RPM Internal Hard Drive (£129.99 @ Amazon UK)
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card (2-Way SLI) (£269.99 @ Amazon UK)
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card (2-Way SLI) (£269.99 @ Amazon UK)
Case: NZXT Phantom 530 (Black) ATX Full Tower Case (£96.25 @ Amazon UK)
Power Supply: SeaSonic G-750 750W 80+ Gold Certified Semi-Modular ATX Power Supply (£105.99 @ Amazon UK)
Optical Drive: Lite-On iHAS124-14 DVD/CD Writer (£12.94 @ More Computers)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) (£75.49 @ Amazon UK)
Total: £1717.08
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-03-16 22:43 GMT+0000
PCPartPicker part list:
http://uk.pcpartpicker.com/p/TBptqs
Price breakdown by merchant: http://uk.pcpartpicker.com/p/TBptqs/by_merchant/
CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor (£271.24 @ Amazon UK)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£24.99 @ Amazon UK)
Motherboard: Asus Z97-A ATX LGA1150 Motherboard (£122.84 @ More Computers)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory (£49.80 @ Kustom PCs)
Storage: Samsung 850 EVO-Series 500GB 2.5" Solid State Drive (£161.80 @ Amazon UK)
Storage: Western Digital BLACK SERIES 3TB 3.5" 7200RPM Internal Hard Drive (£129.99 @ Amazon UK)
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card (2-Way SLI) (£269.99 @ Amazon UK)
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card (2-Way SLI) (£269.99 @ Amazon UK)
Case: NZXT Phantom 530 (Black) ATX Full Tower Case (£96.25 @ Amazon UK)
Power Supply: SeaSonic G-750 750W 80+ Gold Certified Semi-Modular ATX Power Supply (£105.99 @ Amazon UK)
Optical Drive: Lite-On iHAS124-14 DVD/CD Writer (£12.94 @ More Computers)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) (£75.49 @ Amazon UK)
Total: £1591.31
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-03-16 22:47 GMT+0000
The savings aren't huge by going with the 4790K. Also you don't need 2400MHz RAM for gaming. I'm using 1333MHz RAM and games play fine. The speed of the RAM doesn't really matter much for gaming. Both systems should last for over 3 years. The 5820K might last longer than the 4790K if games start using more cores but I'm betting that both CPU's should last about an equal amount of time for gaming. The graphics card is what matters most when it comes to gaming and sli 970's should last for at least 6 years. I don't mean that they will be able to play on the highest settings for that long though but they should still be able to give you an acceptable gaming experience all the way up to that 6th year.