It looks good for the most part.
The Coolermaster Hyper 212 Evo is outdated. The Cryorig H7 makes a much better budget heatsink. Although the Cryorig H5 Universal is preferable.
https://pcpartpicker.com/product/93Crxr/cryorig-cpu-cooler-h7
If you have a Microcenter near by you can get that CPU for $299. If you buy a motherboard at the same time you get an additional $30 bundle discount.
http://www.microcenter.com/product/472529/Core_i7-7700K_Kaby_Lake_42_GHz_LGA_1151_Boxed_Processor
http://www.microcenter.com/product/473025/PRIME_Z270-AR_LGA_1151_ATX_Intel_Motherboard
PSU: The EVGA Supernova NEX is quite low quality Tier 3 or Tier 4 unit. Get the EVGA Supernova GS instead. It is a very high quality Tier 1 unit.
https://pcpartpicker.com/product/h3FXsY/evga-power-supply-220gs0650v1
Tier list
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html