I got rid of my E because it was puny lol but it worked pretty well in push/pull and was dead silent. The SFlex F models are very quiet as well but move a lot more air. They are probably the sweet spot.
If you want the ultimate in silence/performance get a couple San Aces and put them on a fan controller. Better yet get those 120x25mm Delta PWM fans that have a ton of static pressure and undervolt them.
I'm trying to switch to Scythe Gentle Typhoon 120MM x2, calling NCIX now.
thanks for suggestion man