Kralken

Have you seen the Phanteks Evolv X? Tempered glass, RGB, lots of space. Also comes with three decent 140mm fans and an AIO mounting bracket. Definitely has a premium feel with the thick aluminium panels. Comes in at £180 to £200 in the UK.

HardOCP retested a power supply after 10 years and compared with the original review: https://www.hardocp.com/article/2018/03/12/cooler_master_real_power_pro_1000w_psu_10_year_redux/4 Website appears to be down for maintenance at the moment. IIRC, the performance had degraded slightly but was still well within spec. Considering most PSU warranties run for 2 to 10 years, are you comfortable using a 6 year old power supply with such nice parts?

You can download case manuals from the manufacturer's website and it gives component clearances. The manual states that the CPU cooler height clearance is 140mm. That cooler is 124.8mm. You'll need to cross check with the motherboard manual to make sure that the socket is clear of obstructions. Those ITX boards can be tight with the memory slots.

You may want to look at the Maximus XI Code. It's very similar to the Formula except it comes without the EK water blocks on the VRMs. There's been a lot of talk about the 2x4 phase shenanigans on the Code and Hero. Buildzoid has a good deep dive of the VRM on these boards on Gamers Nexus. Overall verdict was they've done better than a normal 2x4, but not as good as a true 8 phase. I've got a Code and a 9700k and I'm very happy with it - it's a nice board. Handles a modest overclock with ease and the BIOS is a treat. I've heard good things about the Aorus Master and Anandtech have just posted a review of it, so you may want to check that out.

Does it flash rapidly? My Asus motherboard has an orange LED right by the SATA cables as well. It's the hard disk activity indicator.

I bought the h115i RGB Platinum back in December, which has even more wires for the RGB. Cable routing is a nightmare. Pump speed and fan speed needs to be controlled in Corsair software through the USB. I downloaded Corsair Link at first as well, which was a mistake. Don't bother. Uninstall and use iCue instead. You can set the fan and pump profiles in iCue and then save the profile to the hardware - no need to keep iCue running in normal use. Once it's saved as a hardware profile it will remember it between boots and you can disable iCue on startup. You can change the fan speeds to react to coolant temperature rather than package or core temperature in iCue. This will prevent noticeable ramp ups of the fans. I found the quiet profile works fine with a 280mm radiator. You may not even want to bother with changing the pump speed at all as the default Balanced profile was actually less audible than the Quiet profile for my pump.