On the subject of fans, bigger fans spin slower and are therefore generally quieter. I have two Vantec Stealth 120mm fans in my case, one for intake and one for exhaust. They've been serving me reliably for years and I'll be sad when they go. The main source of noise in my PC right now is the CPU fan, and aside from going with a Zalman or other passive cooler there's not much to be done about it.
Airflow is tricky. As noted, more fans aren't always better. Creating an efficient airstream is more important.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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