Coles Notes: AIO awesome, Delid and liquid metal TIM biggest drop in temps, Dan A4 Case is wicked and don't order the wrong fan like I did.
Long version:
On the topic of AIO here's my almost complete build. I ordered the wrong size fan so I have to wait to put the slim fan on. I'm in a private location away from shipping anything in so I'll have an update in a few weeks.
CPU: Intel Core i5-8600K 3.6GHz 6-Core Delid with Coollaboratory Liquid Ultra TIM
Delid Kit: Rockit 88 LGA 1151 Kit
CPU Cooler: Asetek 545lc AIO with Noctua NF-A9x14 Fan (Don't order the NF-A9 as it's 25mm...my current error)
Cooler to CPU TIM: Arctic MX-4
Motherboard: ASUS STRIX Z370-I GAMING
Memory: GSKILL 16GB DDR4 3200
Storage: SAMSUNG 512GB 960PRO NVME M.2 SSD
Video Card: Gigabyte GeForce® GTX 1080 Ti Gaming OC 11G
Power Supply: Corsair SF600
Power Supply Cables: Corsair SF Series Premium Individually Sleeved PSU Cable Kit - Black Model# CP-8920202
Case: Dan A4 SFX V2 Black
I'm running 70'C Prime95 Stable Overclock of 4.4ghz *AVX Program* and 4.8ghz on non-AVX. I tried the bios setting for the built in 5ghz mode and it immediately crashed on Prime. I will tweak settings later upon putting the smaller fan onto my cooler and loading it into the case as I suspect temps to climb a bit. Regardless I'm super happy with everything thus far.
Also just an fyi for some noticable things:
1. Old Case and GeminII M4 ran super hot and throttled with base settings under Prime95.
2. Dan A4 Case and Asetek 545lc AIO ran a lot cooler obviously. Video card temps are about 5'C less under full load. No throtting of the CPU at base settings and it's way quieter with this AIO/Fan setup than the previous air cooler. The power supply fan is the loudest. I didn't do any overclocking and can't remember the exact cpu temps under load but 60'C might be where it was...can't remember just being honest.
3. Delid saw at least a 20-25'C improvement based on my initial results. Like I said I didn't spend much time on phase 2 of my project but the delid was the most substantial increase in performance and I could add a conservative overclock with hardly any time spent dialing in an overclock.