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Noctua NH-D14 Dual Radiator CPU Cooler
Id say thermalright Venomous X, used to have one, nice bit of kit
+1 especially when you can get that cooler and a decent pair of quiet 120mm fans for under £40 at the moment.
The megahalems is great, but looking at the price now (a shade under £50 and no fans included) I'd much rather go for the amazing Thermalright Silver Arrow for a few quid more (and it comes with fans included).