I'll second that. I have a 5800x and 3070 Ti in mine, runs great. CPU is cooled with an Arctic LF 2 280 AIO, which I wouldn't recommend to a stranger as it's pretty tight and probably not great for the tubes, but the point being that you can fit some fairly beefy gear. Don't think I would would gain much performance with a larger case as with all the ventilation everything is drawing fresh air.
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I can personally vouch for the Cooler Master NR200. Its super nice to build in and very versatile with PSU and GPU configuration.
The version I built for a friend had a 5600x with a Noctua NH-U9S and a 6700xt and absolutely zero issues with cooling.
Other than that, same thing others are saying, start with the case and power supply and then work backwards.
I'll second that. I have a 5800x and 3070 Ti in mine, runs great. CPU is cooled with an Arctic LF 2 280 AIO, which I wouldn't recommend to a stranger as it's pretty tight and probably not great for the tubes, but the point being that you can fit some fairly beefy gear. Don't think I would would gain much performance with a larger case as with all the ventilation everything is drawing fresh air.
Thirded. Excellent for beginners and people new to ITX, and there's a big community around that case alone.
ETA: Machines and More on YouTube has many, many videos that cover the NR200 and build options.