Monitor recommendations for my rig?

[EpicPrimus]

Just google: “RTX 2070 Super Benchmark resolution”.

https://www.eurogamer.net/articles/digitalfoundry-2019-09-25-geforce-rtx-2070-super-benchmarks-7001#:~:text=The%20RTX%202070%20Super%20is%20just%20one%20frame%20per%20second,about%2012%20per%20cent%20better.

If you scroll down, you will see a table with different GPUs, resolutions and performance in different games.

Just check the tables, on which resolution your GPU performs on its best.