Re: Heatsink fan
Outside of the size of the fan, the biggest considerations are air flow (CFM) and noise (dBA). The higher the CFM, the more air the fan is pushing. The higher the dBA, the louder the fan is (if I remember, 30 is equal to a soft whisper, while 120 is equal to a jet taking off).
If you go to Newegg and pull up case fans, choose 120mm. You can either choose the air flow level you want or choose Advanced Search and plug in the air flow and acceptable noise level. Basically, you can get powerful, quiet fans, but you will pay more for them. If noise is not an issue, you can get cheaper fans.
Another thing to consider is the bearing(s) in the fan. Sleeve bearings make a lot of noise when they start to wear. Ball bearings and the rest are silent, period.
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