So you're having issues finding the PERFECT fan, is that right? Chasing waterfalls...
What's wrong with the ones you have? Can you point out what they are failing at or you don't like? Or is this all an OCD issue where you struggle to settle or make a decision?
I ask because all these fans are simply... just fans. They all work with minor variations. If you';re squabbling over the smallest of details... you're going to just get more "someone said" stuff here. Someone will like Corsair, someone won't, someone will recommend Lian Li, someone will say they suck cuz their dog had them in their super computer, etc etc etc.
Hopefully you can come to terms with the fact your current fans are just fine and enjoy them. Or ignore all the chaos and buy what YOU like.