The last base PC I built was in late 2008 when the i7 was released. I tend to buy (mostly) top of the line stuff so my PCs will last this long. I still run that same motherboard / processor to this day but I've cycled through some gpu / ram upgrades.
In the same kind of spirit, here is the beast I'm laying out for the next 7 years of my life, comments and suggestions are welcome:
Fractal Design Define R5 Gaming Case Cases FDCADEFR5BK
$119.48
Gigabyte LGA1151 Intel Z170 ATX DDR4 Motherboards GA-Z170X-UD5
$172.99
Gigabyte GV-R939G1 GAMING-8GD G1 Gaming Graphics Card AMD R9 390 512 Bit GDDR5 8GB 2xDVI/HDMI/3xDP
$309.99
Microsoft Windows 10 Pro 64 Bit System Builder OEM | PC Disc
$122.98
EVGA SuperNOVA 750 B2 80+ BRONZE, 750W Semi Modular NVIDIA SLI and Crossfire Ready 5 Year Warranty Power Supply 110-B2-0750-VR
$56.99
WD Blue 1TB Desktop Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD10EZEX
$51.99
Kingston Digital 240GB SSDNow V300 SATA 3 2.5 (7mm height) Solid State Drive (SV300S37A/240G)
$69.99
Crucial Ballistix Sport 16GB Kit (8GBx2) DDR4 2400 MT/s (PC4-19200) DIMM 288-Pin Memory BLS2K8G4D240FSA/BLS2C8G4D240FSA
$99.99
Cooler Master Hyper 212 EVO - CPU Cooler with 120mm PWM Fan (RR-212E-20PK-R2)
$28.54
Intel Boxed Core I7-6700K 4.00 GHz 8M Processor Cache 4 LGA 1151 BX80662I76700K
$419.00 (The price just jumped to over $550 while typing this - I'll wait until it comes back down or grab it from a different place)