I recently bought this configuration:
8700k
Define Mini C
Silent Wings 3: rear one 120mm PWM, front two 140mm PWM
motherboard MSI Z370M gaming PRO AC mATX
G.SKILL 16GB Trident Z DDR4 3200MHz CL16 kit.F4-3200C16D-16GTZB
NOCTUA NH-D15S
BE QUIET! Straight Power 10 600W CM (gold)
I was told that this offers the best cooling and silence, and that the Silent Wings 3 fans are virtually inaudible at highest speed as well as the PSU.
So, I think that is a solid base for overclocking, however, I would still overclock it to only 4.5GHz, to prolong the longevity of the components. I would also turn off the "multi-core enhancement" boost.
I've never overclocked a CPU before, so I would appreciate your help.