In the end I decided to go with a FutureBit apollo BTC since I got a good deal on that.
So I just ordered a used S9i for a very good price to see what results I can get with the standard fans.
So which one is it, then?
Apollo would be my personal choice, it's easy to use and does not need any tinkering or firmware manipulation. Has built in 125W Eco mode:
Apollo Miner
Hashrate: 1997 GH/s
Error rate: 0.3%
Power draw: 125 W
Temperature: 55°C
Fan: 2128 RPM
At this setting is inaudible, it has only one small fan, but I can't hear it. In a quiet office at night, my computer is much louder.
No problem to go below 125W, just tweak desired hashrate output setting.
Pic of Apollo inside my computer case:
https://i.imgur.com/nguQRAC.jpeg