Btw, if you didn't know, you'll have to purchase an entirely new CPU if you want to overclock. Anything from intel with a "K" will work. Thanks for taking my comment as advice.
The water cooler in my opinion is useless if you're not going to overclock.
The motherboard... well... z270 is ment for overclock. Get a b250 board for less. MUCH less.
PSU gets a thumbs up from me.
That GTX 1070... is it overpriced? You can get a GTX 1080 new as cheap as $500.
I think you can pool a bit more money for an NVMe M.2 SSD.
Overall it's a very good build. (The criticism isn't directed as hate, just some better things to do IN MY OPINION AND NEEDS.)
Dude, I think you added random parts at the end.
Be careful, some games won't run on a dual-core, much less a pentium. Also, do they bottleneck?