I have a fan controller. Love it. I'm just having a bit of a tough time getting the right fans for the top of the case above the radiator.
Since the fans are laying horizontally, you will want a double ball bearing fan. Are your current fans sleeve bearing? Those have a shorter lifespan, especially when horizontal (and they are notorious for noise beyond just air). It's really bad in high-RPM fans like Yate Loons, or Slipstreams.
Since these are radiator fans, you should really make the investment in Gentle Typhoons. LINK
They might be cheaper elsewhere, but I'm just providing the link to show you what to look for.
They exist in higher and lower RPM models as well. 1850rpm is the most common, and the only noise you will hear is air, and how much air you want to hear is up to you. I have 5 of them, plus 5 coolermaster LED fans for various case cooling, and I still think my pump is louder than those. And even with all of those at full power, I can hear my HDD working. But overall, my computer is quiet considering the amount of fans and the high powered pump.
Of course, there are other high quality, durable quiet fans out there, but I the Gentle Typhoons are the best with which I've had personal experience
This post was edited on 4/19 at 1:33 pm