I hope this gets more attention then the x thousand Youtube comments.
Monitor:
Since you are useing NVidia, I would recommend: ASUS ROG Swift PG278QR. With 16 of these, you could also make a video about, how much of them have backlight bleeding. Sadly a common issue with a lot of Asus ROG Monitors. Not sure how this would effect your future with Asus.
And Always get a Monitor Desk Mount. They give you so much freedom and Deskspace. Thanks to VESA, you buy it once and use it forever.
Headphones:
I recommend ANC Headphones, I work in noise Offices and a good pair of ANC Headphones are worth every penny. I love my Sony WH-1000XM2 and its always suprising when you take them off and enter the noise again. Add a Magnet USB Cable for 5 Bucks, a headphone stand like this: https://www.ebay.com/itm/2Pcs-Headphone-Stand-Hanger-Gaming-Headset-Hanger-Wall-PC-Monitor-Stand-Good-/112123716740 and a bit of engineering. This way the magnet USB cable automatically connects, when you put it on the stand.
Desk Speaker:
You can never go wrond with a pair off Nubert nuPro A-200 With roughly 700€ a pair definetly not a cheap choice.
For the console get a good soundbar: Nubert nuPro AS-250 Trust me, this thing is awesome. Definetly worth a test. German sound engineering in its best form.
Goodies:
Add a few USB Extension Monitors like this. These are great for Streaming and Twich chats.
And PLEASE for the love of every admin in the world. Put A LOT of effort in the cablemanagement, not like you usually do