Hello all!

I am building a new computer and I haven't really been keeping up with the new hardware since I built my current one about 5 years ago. The three main things I am worried about with this computer is that is a bit more future-proof, I don't have any parts that bottleneck or are overkill, and that it is relatively QUIET. Here is my current (very rough) draft of parts:

CPU - Intel Core i5 7600k
CPU Cooler - CM Hyper 212 EVO
Motherboard - MSI Z720-A Pro LGA 1151
RAM - Corsair VENGEANCE LPX 16GB (2 x 8GB) DDR4-300
GPU - Asus GeForce GTX 1070 8GB
Power Supply - Seasonic EVO Edition 620W

Here is a link to the list : https://pcpartpicker.com/list/DpdtvV

Things to note:

-I only really play games and don't do any editing or things like that
-I play at 1080p max, definitely not 4K and I just learned that 1440P is a thing
-I have a hdd on this computer that I would like to keep, I'm just really confused on if I would need to buy windows 10 again in order to put it on an ssd and then delete it off of this hdd...?
-I have no idea what to do about the case, motherboard, or power supply because there are just so many out there
-I kinda want it to all look nice and cohesive with colors and all that but I don't need anything with flashing RBG lights or remote-control nonsense
-How big would the ssd have to be if I just wanted it to be the OS and maybe a few games?

In conclusion, the amount of parts to pick from is really starting to get to me. I am by no means an expert at this but I do have a general understanding of what each PART does and what the numbers mean. I am not too worried about the price as long as it stays around $1300ish. One thing I very much regret is that, while building the computer I have now, I bought what I could using the money I had available and didn't wait until I could buy what I really wanted. Any help is very much appreciated and if you see any blaring problems with my draft, please don't be mad!   

Thanks so much!Why not use an i5 8600K and a Z370 motherboard? You will have 2 more cores and more performance.