This was my first rig build, I decided to go as top tier as I could afford and went on the basis of liquid cooling for major components. which was why I chose to go with a waterforce 2080ti and an AIO for my CPU.
I opted for a case with large internal volume and lots of ventilation options to get the best possible airflow, as well as orientating my radiators as exhaust fans to promote positive cool airflow.
My 9700k runs at a 5.2ghz all core overclock and rarely reaches over 65c CPU temperature, and my GPU runs at a 2080mhz OC, and at 100% utilisation does not exceed 60c.