Some doubts about cooling, psu and case on a i7-8700K build

[im_shadows]

Hey guys, I made my mind about my future setup, but there are some specs on on my list that I wish you could help me:
*MOBO: ASROCK Extreme4 Z370/ASROCK Fatal1ty K6 Z370/Gigabyte AORUS Ultra Gaming/Gigabyte AORUS Gaming 7
CPU: i7-8700K
**CPU Cooling Unit: ?
GPU: GeForce GTX 1080
RAM: G.Skill TridentZ 16GB 3200Mhz CL16
HDD: 1TB 7200RPM
SSD: Samsung 850C 250GB
***CASE: ?
****PSU: ?

*I'm almost 100% sure I'm taking the ASROCK Fatal1ty K6 Z370, but I want you guys opinion. I want a solid MOBO capable of reaching high clocks if needed. (I don't care about Wi-Fi/Bluetooth)

**On CPU Cooling Unit, I thought about getting a cheap CPU FAN (under $100,00), that would allow me to use the computer normally (probably gaming would be the most stressful task I would do), without overclocking it. And maybe I could get a WaterCooler on Black-Friday or next year's Black-Friday. Anyway, I want a CPU FAN capable of lasting until a I buy a WaterCooler someday in the next months/year. Some people suggested to me the DC Gammaxx 400, which I think is cheap, but don't know if it could handle this setup well. What CPU FAN would you suggest?

***About Case, I don't really have much knowledge. I've looked into 3 models, the CM Masterbox Pro 5 (supports 3 front fans and 1 back), the Cougar Archon Mid Tower (supports 2 front fans and 2 side) and the CM Haf 912 (supports 2 front fans, 2 top fans, 1 back fan and 1 side). So, are any of the three good Cases? As I already sad, I'm not an expert at Cases, actually I don't know s*** but the CM Haf 912 looked the best of the three for me. What would you suggest besides the ones listed above?

****And lastly, the PSU. Would it be possible for me to maintain my CX600 and get a 750W/850W PSU on Black-Friday (obviously wouldn't overclock until there).

Before I forget, this PC will used just for gaming, I don't stream/work on it.

 

[Zerk2012]

PCPartPicker part list / Price breakdown by merchant

CPU Cooler: CRYORIG - R1 Universal 76.0 CFM CPU Cooler ($89.88 @ OutletPC)
CPU Cooler: CRYORIG - H5 Universal 65.0 CFM CPU Cooler ($46.89 @ OutletPC)
Motherboard: ASRock - Z370 Extreme4 ATX LGA1151 Motherboard ($168.80 @ OutletPC)
Total: $305.57
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-02-23 14:21 EST-0500

The H5 cooler will allow for a mild overclock the R1 is what I use and will allow for a higher overclock.
You could use the CX600 till you can replace it. 650 watts will do with that build and overclocking.
Buy the case thst you like although a bit dated the 912 works fine. If you get the older model thst don't come with the front 200mm fan then buy one to put in the ftont.

 

[im_shadows]

PCPartPicker part list / Price breakdown by merchant

CPU Cooler: CRYORIG - R1 Universal 76.0 CFM CPU Cooler ($89.88 @ OutletPC)
CPU Cooler: CRYORIG - H5 Universal 65.0 CFM CPU Cooler ($46.89 @ OutletPC)
Motherboard: ASRock - Z370 Extreme4 ATX LGA1151 Motherboard ($168.80 @ OutletPC)
Total: $305.57
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-02-23 14:21 EST-0500

The H5 cooler will allow for a mild overclock the R1 is what I use and will allow for a higher overclock.
You could use the CX600 till you can replace it. 650 watts will do with that build and overclocking.
Buy the case thst you like although a bit dated the 912 works fine. If you get the older model thst don't come with the front 200mm fan then buy one to put in the ftont.

Unfortunetly, these coolers cost almost the price of a WaterCooler in Brazil and I can't afford it because they cost 10x more than in the US. And about the MOBO, why would you get the Extreme4 isntead of the Fatal1ty?