also for quietness you can purchase sound dampening material to put on large surfaces inside your case. it is very cheap and surprisingly effective. its not something i see done often but it does work. a few sound boards were recently installed in my school cafeteria and took the sound level form ear drum-bleeding to a low din.
I have 2 Fractal R2 both come with noise dampening from stock, it's called Bitumen I think it's 2mm thick.
My surfing PC has AX750 psu which propably is passive most of the time as my system is below 150w most of the time.
Also I have 2 mechanical harddrives and a OS ssd disk, I have one 500rpm scythe sliptream fan as intake bottom fron and one 500rpm as exhaust.
I can run it passive with Scythe Mugen but I decided to put a 500rpm on it aswell.
I can't hear anything in it unless there is heavy load on the mechanical drives then slight noise.
In fact the only source of noise is my Display which has coil whine.