I was able to do more research on ITX cases though and it looks like I'm going to drop the idea of an SFF pc for now. I'm not too impressed with the thermal performance of even some of the best ITX cases out there (Coolermaster NR200, SilverStone SG13, SilverStone RVZ03, etc.).
All these appear to hit 70 - 85 at full load.
The alternative that I'm now considering is a mid-tower PC with some overclocking on the CPU and the GPU to get 10% - 15% performance boost and bridge some of the gap between the 2070 Super and the upcoming 3070 (which I won't be getting). I know that the thermals will spike if I overclock, but I'm hoping that the mid-tower, with some good coolers/fans will be able to keep temps under 80. For reference, the cabinet that I'm considering (Corsair 275R Airflow) heats to 65 - 70 at full load without overclocking.
I've never overclocked before, but after reading some guides, it seems that manufacturers have made this quite straightforward now. Any advice on this topic will be appreciated!
Would my Mid-Tower build work for overclocking? Sharing the build here again
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Also been reading about B450 vs B550 vs B570. Is B550 really worth the extra investment?