No OC = More fans are useless. Your system will run at around 30-40C at idle, depending on ambient temp, and reach up to ~75C at max load. (At idle, some fans will probably not even spin.) That's all within fine limits. Adding a fan or two will knock off maybe 5 degrees at most. Just clean the case annually (more if pets involved) of dust to keep the airflow intact. (Use a hairdryer on no-heat setting.)
Budget for monitor? You can also check out these review websites for an idea.
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But generally, the recommendation is either the Asus TUF Gaming VG27AQ or LG 27GL850.
Thank you!
Budget ist not a problem, fortunately. I'm just hesistant to spend 600-700 bucks on a monitor, if not necessary.