Bequiet makes pretty quiet fans from my experience with their dark rock pro 3 cooler. Their fans tend to be really quiet but a little under powered as a trade off, somewhat lower cfm etc. Part of the noise from fans isn't the fan itself, it's the airflow. Blow air hard enough over various surfaces like past hard drive cages and intake grills, it's going to make noise even if the fan is silent.
Cheap fans you tend to get what you pay for. Just replaced the fan on a 212 evo cooler after 18mo, the fan that came with it the cheap bearings went kaput. Replaced it with a better quality scythe s-flex fan that was used in a previous system for close to 5yrs and it's still running smoother than the coolermaster fan. You tend to get what you pay for.
Cougar fans are pretty decent airflow to noise ratio and decent quality. So are phanteks ph140sp's, barely makes any noise at full speed and it's the soft whoosh of air through the exhaust grill of my case. The phanteks aren't exactly cheap but not too bad, around $15 for 140mm size and have a 5yr warranty. Corsair's prices have gotten pretty proud the past couple years and come close to (and in some cases) rival Noctua's prices. They're no noctua in my opinion.
Keep in mind that corsair's fans are a bit different, the plain black on black fan/housing original styled fans with colored rings are decent. The newer versions with led lighting use inexpensive sleeve bearings which is why they're cheaper than the original af/sp.
As eximo pointed out windowed cases aren't usually considered silent since there's potential for window rattle depending how it's attached, it can allow sounds to amplify a bit vs a padded case. Cases with too much padding not only collect dust on the foam, they may increase temps a bit and require more airflow through the case - meaning faster fan speeds killing the whole point of 'silent'. Intake and exhaust fans will still be a noise source since you can't pad those over, the case has to breathe.
The loudest things will likely be the gpu fans under load and potentially the drive if you have a mechanical hard drive. Fans shouldn't need rubber mounts, quality fans don't vibrate. I was a bit worried on my enthoo pro because I didn't have silicon isolator mounts big enough to mount fans to the top of the case, I had to hard mount them with no rubber corners, nothing. Just fan frame to case directly and no issues, no noise. The noctua redux are nice and balanced.
By all accounts the enthoo pro should be 'noisy'. It has a window, it has an open rear, bottom, top and front. I use a fan controller with the stock 200mm fan up front, 140mm in back and two 140mm noctua's up top all running at around 50-60% speed if that. Sitting next to my monitor it's quiet. Firing a game up is another story but that's my gpu. A single fan oc'd hd7850 is far from silent lmao. Goes to show though that it's more about the fans and fan control than a 'silent' case. It sounds like you've already chosen quiet components which is a lot of what makes a pc noisy or not.
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