Can I just say there must be a problem with your PWM settings because the fan on the hyper 212 plus is very quiet when running at low rpm.
Mine is running at 860rpm on my i5 at idle (32c temp) and it is the quietest fan in my case.
You can actually buy these fans seperately, they are called Blademasters and cost around £10
http://www.ebuyer.com/product/221740
As with all PWM fans, at full speed they are not so quiet, that's just down to the rpm they run at and the amount of air they move, a PWM fan normally has a relatively high base rpm because it's designed to be slowed down by the PWM function so it can run slow and quiet but still be able to run fast if far higher volumes of air is required.
The 120mm Blademaster runs at 2000rpm at full speed, so yes it's loud, but at 2000rpm any fan is loud and it'll move a heck of a lot of air.
RPM is the key factor in noise of fans of a simular size, untill you go below about 1100rpm on a 120mm fan, then motor & bareing noise is often louder than the fan it self and there's almost no motor/bareing noise on my hyper 212 plus fan.