Your build looks very good, you can build as is.
I have a few thoughts:
1. For a top end build using a i7-8700K a better cooler will be quieter and cool better.
The hyper212 is popular, but not exactly good or easy to install.
I might suggest a noctua NH-D15s, which will fit nicely, but other similar coolers will do as well.
There is no reason in such a good case for a liquid cooler.
They are more expensive, less reliable, noisier, harder to install, and do not cool any better in a good case like yours.
And... an air cooler will not leak.
2. I think there are more reliable hard drives available; WD or Hitachi.
Here is a nice article on the WD "rainbow"
https://www.pugetsystems.com/labs/articles/Understanding-the-WD-Rainbow-674/
3. One good thing about EVGA is that you get a 90 day upgrade option for a stronger card.
Read the fine print.
It is usually best to buy all at once since prices tend to drop over time.
But, I see Seasonic regularly on sale.
If you can get your case on sale, that is good too.
Monitors do not change much either.