Whatever you get make sure it has heatpipes.
Heatpipes contain either water or r-132. Either increases the heat capacity of the heatsink, thus keeping temperatures more steady. The xp-120 is awesome. The xp-90 is also very good. For 12cm fans try the cooler master LED fans on newegg. I have three of them on a BI Pro 3 mounted outside the case via a radbox. They are three feet from me right now and I can't hear them.
The great thing about the xp-120 is the fact that you can get reasonable performance with a low noise fan. Froogle it for the best price (won't be newegg, they are charging about $65, others charge $49)
Hope this was helpful
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