Excellent build for high FPS gaming! The 9700K coupled to a RTX 2080 Super is a great combination for max FPS especially at 1080P. The motherboard is also a great choice as it is a top end board with a great 12+1 Phase VRM and it will handle overclocking duties to the max on the 9700K.
All top end parts in the RAM, PSU and Case for great airflow...all good!
Yes you could save some money but the components are all top end and if you have the budget...why not.