Making an SG05 quieter

[vince1]

I've currently got an SG05 with a Gigabyte H55N-USB3, i3, Power Colour 5570, Prolimatech Samuel 17 cooler with a 120mm Fractal Designs fan, i'm also using the stock front fan with the case. At the moment the current combination is pretty noisy and I've been looking at the H60 or maybe changing the case fan and the fan installed on the cpu cooler but not sure which way to go. Any help gratefully received.

 

[vince1]

So i checked all the fans by disconnecting them one by one and found it's the PSU making most of the noise. Does anyone know if it's very difficult changing PSU fans, any help gratefully received.