Gamers Nexus has a review on an older revision for a Dual Tower, i would take a look at it. Problem with comments online it that no one stop to say good things, so usually it's going to be about bad experiences, if you take a look on the PS120SE for example, there's 4-5, maybe more Thermalright direct sellers, all those pages have reviews, so at least 1000-1500 reviews say it's at least 4.5/5, that's really good.
About the SSD, is not that's incompatible, as PCIe is backward compatible, it's only that for $5 more you get a better SSD. The 980 PRO is at it's lowest price so far, i would grab one.
I would go for the ASUS, it has less length, won't be sagging as much, has bigger fans, meaning they are going to be a bit more silent at full speed. 3 Fans usually are a bit smaller, meaning they can reach higher RPM, so they can be a bit loud.
4 fans is more than enough, with the components you are going for you won't have any cooling issues, even with 2-3 fans on the case, it's mainly for visuals.
But... yes, more fans would help a bit, if you have 4x fans, maybe grab two fans to use them at the top of the case to help exhaust air. If you live in a hot place, better airflow will help extracting hot air and keep temperatures under control.
Likei said, save money on some itens, and either grab 2 of those fans, or go for something even cheaper, Thermalrigth has a bunch of 120mm RGB fans (and packs) for under $15
Corsair's RGB stuff can be a real PITA to configure and they have their own proprietary connectors (Jay from JayzTwoCents has mentioned this many times), so, purely for that reason, I'd look at a different brand of RGB fans and cooler.
EKWB 360mm AIO Cooler Elite for $190 on Amazon would be more suitable for a 5950X.
That motherboard has 2 M.2 slots (one is Gen 4, the other is Gen 3), so, might as well make use of both. Crucial P5 Plus 500GB as your boot drive and a 2TB Crucial P3 as your gaming NVMe SSD. It might cost $20 more but having games on a separate drive to OS does help loading times.
This Fenvi 802.11ax WiFi 6E Card seems to have much higher connection speeds than that Gigabyte one and is the same money.
I've used TheUnitySoft for Windows activation keys 10+ times and haven't had a problem when the instructions are followed. Saves you about $100 too. GVGMall is also really good for Windows keys. You can download the Windows 11 Media Creation Tool directly from Microsoft on to a USB.
Arctic P12 PWM Case Fan 3-pack will do the job well - my PC has 4 of the non-RGB P12 PWM PST fans and they do a great job. The 6-year warranty is also nice. This upHere ARGB fan hub, to save frustration and cabling, is $12 and the Hub would connect to the motherboard to regulate both the ARGB and fan speeds. You can also connect up to 6 fans on the Hub, so, room to expand should you need it.