thank you for the input and the references, this is highly appreciated!
The concerns for the motherboard I am already looking into, do you have any thoughts on the ASRock B650M PG LIGHTNING, or the ASRock B650 PG LIGHTNING? latter is unfortunately not in stock, but besides the missing heatsink on top and the size I also do not really see a practical difference between the two
it was funny to me, that nobody commented on the ram yet, that was literally the cheapest I found for the MB. So I can try to reiterate that part
concerning monitor I was recently very lucky. I friend of mine fried his own and bought a new one, then he ask me, if I want to have it in order to try to fix it. Turned out the internal PSU was fried… so I tossed it out, soldered a barrel jack to the input wires and now use a 20euro external PSU. its a 1440p monitor with 165Hz.