The cooler is a nice choice. Not sure if it will fit the upcoming socket for Skylake. If he wishes, air coolers are still competitive with liquid coolers. Consider Noctua.
Storage
Samsung or the upcoming Intel for SSDs.
For spinner HDD drives time to move to 2TB to 4 TB drives. The quality of the 1TB drives are dropping as the larger versions climb. Avoid RAID setups. Back data up rather than striping and or mirroring. If you need raw speed a solid 1TB SSD from Samsung can be found for $250.
Case
Damn fine case. Corsair has the Graphite series that is neck and neck with Phanteks. I have been considering both of these and am personally stumped.
http://www.corsair.com/en-us/cases/graphite-seriesPower supply
I always recommend the Corsair HX or TX series if possible. 650W is fine with a high quality supply. I run 700 to 750W because over time they age, fans slow down, heat sinks get clogged, and so on. The extra overhead is cheap and makes up for lost efficiency over time.
Optical Drive
Consider changing the optical drive to a Blue-Ray burner instead. Because you just never know when you will need it.
NIC
Why the second network adapter? The adapter designed into the mobo is no slouch.
Fans
These are fine for the top and rear fans not for the front fans. On the front he should consider Corsair SP series fans.
Fan setup.
Top of case front fan = INTAKE (push pull is nice)
Top of case rear fan = exhaust (push pull is nice)
Front panel fans = intakes (static pressure fans)
Rear fan = exhaust
Keyboard mouse and monitor are kind of personal choices however given full leeway I usually recommend the following.
Keyboard
Ducky Shine 4 with MX brown switches (please disregard the stupid name)
http://mechanicalkeyboards.com/shop/index.php?l=product_detail&p=1013Mouse
Logitech G502
Monitor
Asus VG278HE
BenQ and AOC have nearly equivalent models
Audio
As we have discussed before get a USB based amp DAC that is external to his machine. I use this.
http://centrance.com/products/hifi-m8/Headset
The OPPO PM-2 or the Audeze LCD-X
MIC
Antlion ModMic 4
Other Advice
Get a 7 port powered USB hub or two. This really takes current load off of your mobo If a port or device fail you can replace a hub lots easier than a mobo. They charge devices faster too.
I have had solid luck with this company and own this.
http://www.amazon.com/gp/product/B00FVS9U8O/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1Never use native on-board motherboard USB ports if you can avoid it. Plug the USB hub in and let that be your set of outlets.
Mouse Pad
SteelSeries QCKplus
Video Card
GTX970. I favor Asus, Gigabyte, and EVGA (ACX2.0). If he is going to have more than two monitors a GTX980 would be in order.
All that said, TONS of room to vary this build at every turn. Usually plenty of wiggling and figuring needed to fit personal needs, wants and budgets. Any odds that I could Skype with him and work things through with the build? This is typically what I do with most folks I help out.