Upgrading Motherboard, CPU and RAM

[OPPezen]

I'm looking for an overhaul of my system, since I bought the GTX 1070 some months ago and want the rest of the system to be up to date.

My current system:
Gpu: MSI Geforce GTX 1070
intel(r) core(tm) i5-4440 cpu @ 3.10 ghz
8 gb ram DDR3
1x 256 gb ssd and 1 tb HDD.
550 watt power supply BeQuiet (Bronze 3 1/2 years old)
Motherboard: ASUS Z87 K C2

I've been looking at this upgrade:
I5 8600k
MSI Z370 Pro Carbon
DDR4 2x8gb G.Skill 3200 MHZ

Or

I5 8600k
Asus Prime z370-P
Corsair Vengeance LPX DDR4 2400MHz 2x8GB

The price difference is around 100 euro, where the first build is the most expensive one.
(I don't mind switching out parts)

1) I read on some forum that the i5 8600k works best with ram thats 2666mhz+ and that 3200mhz is the sweetspot. So is it worth paying a few extra euros?

2) Also will my old Noctua NH-L9x65 CPU cooler do fine with the i5 8600k. Not overclocking for now of course.

3) I can't really decide whats the best mobo for the price. I like the MSI, but I feel like you're paying a bit more for the flashy stuff. But i'm also afraid that the ASUS is too cheap.
This system should last me 2-3 years.

4) Any other suggestions, like another mobo, ram or CPU?

OBS: I play games like ARK, Fortnite, League and The WItcher. Also I do some light Editing for youtube.


Edit: My budget is around 600 euros. Also I prefer a system that just works from the beginning, i'm not really that much of a tech guy, hence why im asking here.

 

[Zerk2012]

From this that cooler is made for 84 watts and less processors so you need to upgrade that.

https://noctua.at/en/nh-l9x65

I would buy this board and memory.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i5-8600K 3.6GHz 6-Core Processor (£233.24 @ AWD-IT)
CPU Cooler: CRYORIG - H7 49.0 CFM CPU Cooler (£39.46 @ Amazon UK)
Motherboard: ASRock - Z370 Extreme4 ATX LGA1151 Motherboard (£147.97 @ More Computers)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory (£184.03 @ More Computers)
Total: £604.70
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-22 15:49 GMT+0000

 

[OPPezen]

Never heard of ASRock before.
That build is a little more expensive then the ones I listed, but i'll look into it, thanks for the quick answer.

 

[Finstar]

Never heard of ASRock before.
That build is a little more expensive then the ones I listed, but i'll look into it, thanks for the quick answer.

From my experiences, ASRock is much better than msi and Asus combined.