Do you have photos or at least a description of your machine CES? I ask because the Blacks are considerably louder than the Blues, which are louder again than the greens.
I am pleased to answer your questions but I am not certain that it will help.
I have two computers, two inkjets, a small room fan and an HP laser printer in an office. I probably don't have the worlds best hearing. That may be the biggest variable
The inkject printers make no noise when not in use. The laser printer has a loud fan, but it is often just turned off.
The room fan is only on in the summer when I am getting too much heat from the sun. It is usually not on.
I have two Lian Li cases. The A05 makes no discernible noise. It uses the stock fans at stock voltage. I have a noctua downdraft cooler set on low.
The v351 has fan noise, I have been putzing around with using some small fans to cool it. I currently have two 1200 rpm Slipstreams in it running at 7v, plus a 60mm fan on the NB and a 40mm fan on the SB. It is running a little shurekin cooler with stock fan. The board is running the shurekin PWM fan at 100%.
The shurekin generates about half the noise from the v351 - or more. I tried replacing the stock fan with a 140mm slow speed noiseblocker. That generated the same temps but with much less noise, easily a 50% reduction in noise.
I have two Black WD 1T hard drives running in eSata Docks. I don't notice them except when they are actively accessing files. And I mean active. If I am just getting a word file or somthing similar I don't notice any noise from them (though it might be because I am distracted).
I don't mind noise if I am in control of it. Like when I am scanning or printing.
There is something peculiar about my drives (and it includes my velociratpr boot drives as well as my WD 1T data drives) sometime they just start churning for no good reason and generate a lot of seek noise for a minute or so. I can understand that on the boot drive, but I really wonder what is going on when it does that on the data drive. When it is really churning away and I am not doing anything - that I don't like - but it doesn't happen more than maybe once a week or so.