Anyway,
I just took out my PSU (I have a Chieftec Dragon cabinet), opened it up, DID NOT TOUCH THE CAPACITORS!!!!!!, and changed the lousy crappy noisy fan with a 12db NoiseBlocker one. Works like a charm, and now I found out that the radiator in my room is fucking loud with all the cluckcluckclucking of the water...
I also changed my graphics card cooler to a passive Zalman one, one less fan to worry about. Next step is replacing the CPU cooler with a silent Zalman one, and my computer is dead silent. Until then, I turn down my fan to 40%, works great as long as I'm not powergaming. The temperature rises to about 40 C when surfing etc, but that's not bad at all.
Finally, I'm going to buy some resonance and vibration padding - that should do the final trick.