Do you really need optimal airflow?
If you have at least two 120mm intake fans, you will have sufficient airflow.
2 140mm fans are very good.
Noise comes from fans running at high rpm's. The more fans, and higher rpm's, the noisier.
I would start with just the supplied two 140mm fans in the stock positions, one intake in front, and one exhaust on top.
Actually, I would try relocating the top fan to the front as a second intake. This gives you a positive pressure situation which will keep your case clearer of dust.
Think about it...
A good graphics card will not need as much airflow as a single 140mm fan can provide.
A good air cooler ditto.
Two such 140mm intake fans will provide sufficient airflow.
Lastly, cpu and gpu can run hot, but they are built to tolerate some heat.
If they get too hot, they will downclock to protect from damage.