I'd try and work out what is causing the most noise in your case before splashing out on new hardware, etc.
If you think it's the CPU cooler then take a look at the Noctua NH-U12P or Thermalright Ultra 120. The Noctua comes with a very quiet/silent fan and performs very well. The Thermalright does not come with a fan so you can choose which quiet/silent fan to fit onto it yourself.
Also consider replacing your case fans if they are making a lot of noise. Scythe, Noctua and Yate Loon make some very quiet fans. It might be worth getting a fan controller so you can control the noise/amount of air flow depending on your needs.
From looking at reviews the Hiper 480W Type-R PSU is meant to be pretty quiet, so I would leave it for now and concentrate on your CPU cooler and case fans.