Is this build future proof?

Solution
It is not worth it to future-proof. You'll want in-silicon fixes for spectre/meltdown sooner than later. In any case the best future proofing in money in your pocket, where you can buy more performance later for less money, in short do NOT over-commit. For 1440p gaming all you need is GTX1070 and i5-8600k.

BTW you should look here:
http://www.microcenter.com/product/486088/Core_i7-8700K_Coffee_Lake_37_GHz_LGA_1151_Boxed_Processor

The 8700k is eseentially $270 (after the $30 discount on the motherboard).
If you want 3 years at 1440p you need to go for a 1080ti. May want a bigger PSU if you move up to a 1080ti. Everything else looks pretty good.

PCPartPicker part list: https://pcpartpicker.com/list/rNpvfH
Price breakdown by merchant: https://pcpartpicker.com/list/rNpvfH/by_merchant/

CPU: Intel - Core i7-8700K 3.7GHz 6-Core Processor ($339.79 @ SuperBiiz)
CPU Cooler: CRYORIG - H5 Ultimate 76.0 CFM CPU Cooler ($46.89 @ OutletPC)
Thermal Compound: Noctua - NT-H1 3.5g Thermal Paste ($5.90 @ Amazon)
Motherboard: Gigabyte - Z370 AORUS Gaming 3 (rev. 1.0) ATX LGA1151 Motherboard ($148.99 @ SuperBiiz)
Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-3200 Memory ($169.99 @ Newegg)
Storage: Samsung - 860 Evo 250GB 2.5" Solid State Drive ($79.99 @ Amazon)
Storage: Seagate - Constellation ES.3 3TB 3.5" 7200RPM Internal Hard Drive ($86.00 @ Newegg Marketplace)
Video Card: Zotac - GeForce GTX 1080 Ti 11GB AMP Extreme Video Card ($877.99 @ SuperBiiz)
Case: NZXT - S340 (White) ATX Mid Tower Case ($59.99 @ Newegg)
Power Supply: SeaSonic - FOCUS Plus Gold 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($79.98 @ Newegg)
Total: $1895.51
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-05-02 11:55 EDT-0400
 
It is not worth it to future-proof. You'll want in-silicon fixes for spectre/meltdown sooner than later. In any case the best future proofing in money in your pocket, where you can buy more performance later for less money, in short do NOT over-commit. For 1440p gaming all you need is GTX1070 and i5-8600k.

BTW you should look here:
http://www.microcenter.com/product/486088/Core_i7-8700K_Coffee_Lake_37_GHz_LGA_1151_Boxed_Processor

The 8700k is eseentially $270 (after the $30 discount on the motherboard).
 
Solution


Not only that there really is no such thing as "future proofing". You pretty much have to buy what you can buy with what's available and go from there.
 


It is not about gaming, it is about security. Software patches, firmware patches only mitigate the problems, but it is still waiting for someone to find some way to get around the hurdles and exploit it. I much rather have a real hardware fix in-silicon, then those paths are truly closed off.