Msi pro z690
Msi pro z690
You could wait for the 13600K to arrive and see if it becomes a better gaming CPU. In reality, the 4080 makes sense only for 4K playback, so either option should work with the 12600K.
At 240Hz it makes sense, a 3080 seems reasonable. A 4080 probably isn't too much extra, though we'll find out once independent reviews are available.
Aiming to create something lasting five years or more, I’m okay with it being a bit excessive right now.