Based around a 12cm fan, the Thermaltake Big Typhoon works very well, if you can fit it in your case.  Take a look at techPowerUp!’s review for an idea just how big it is, and what you need to do to be able to install it.
“Thermaltake has been around for only seven years, but every one of them has been spent turning the heads of the hardware community. From the original Golden Orb’s effective cooling at near silent levels to the current array of water and air coolers, Thermaltake continues to impress with both design and function. When Thermaltake designed the Big Typhoon, they went all out, using six heatpipes and a 120mm fan. Is bigger really better? Let’s find out…”

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