Do you need all the peripherals? Keyboard, mouse, monitor, speakers, etc?

You could drop the CPU cooler if you want to save some money. Also I'm not sure if you have a reason for wanting the Samsung, but you could get a Crucial MX300 275GB SSD for about 90 bucks. Also you should upgrade the HDD to a Seagate, Toshiba, or Western Digital 7200RPM. Grab a Corsair CXM 550W power unit as well.

Depending on the resolution and refresh rate he's playing at a GTX 1060 could work for the build as well, which will lower cost considerably.

This would have him gaming long into the future with high settings, etc. No peripherals though. Basic white/black color scheme. http://pcpartpicker.com/list/77ZgPs

You didn't have the picker list link in your original post, hence this list. I'll leave it so you can compare.

What resolution and refresh rate will he be using? You can save a couple of bucks with a GTX1060-6GB or RX-480 if he's not playing more than 1080p 60Hz, although both will get you in the door with decent 1440p. The chosen GTX-1070 is great for 1080p 144Hz, or good 1440p 60Hz.

Since the list in the above link has a non-K CPU, you can cut out the CPU cooler as the non-K CPUs come with coolers, if you need to shave off a few bucks. The aftermarket cooler will more than likely shave a few degrees off and run quieter though in comparison to the stock cooler.

You could also shave a few bucks off with a Crucial MX300 275GB HDD also, and maybe direct it at a faster HDD (US Pricing has a Hitachi model that is 7200RPM, SATA-3 (6GB transfer speed), with a 64MB cache/buffer for around the same price as some 1TB models. I haven't checked Canadian prices yet for comparison though.

Those first-gen EVGA PSUs: many aren't as good as they could have been, as in they aren't all that great. I'd make some changes to get a better unit.

PCPartPicker part list / Price breakdown by merchant

I have listened to most of the comments and made some appropriate changes

http://ca.pcpartpicker.com/user/gugu96/saved/sDwhMp

And I saved the future build on my profile.

cooler: removed, the i5-k had no cooler, the non-k has intel cooler hdd: lowered from WD to Toshiba gpu: went from 1070 to 1060. I'm sure it's all VR ready, no SLI possible psu: went from 650 to Corsair CX550M, though it's same price ssd: went from samsung evo (love them) to Crucial MX300

I should have more details next week and I'll ask them about monitor and keyboard mouse.