I have a MSI WindBox DC100. unfortunately it has a very nosy stock fan - so i'd like to replace it (in a 'im going to bolt a 80mm fan on the outside of the case' kind ...

So my PC was noisy and I invested in 120mm Akasa Apache fans. Now I have 4 Apache fans (2 on the CPU cooler), 1 sucking the air out at the back and to balance the pressure, one Apache blowing cold air ...