For some extreme cooling get a YS-TECH 120mm it will push 180cfm down side is its noiser than a freight train.
But a good fan controller with all your large fans hooked up is bliss since you can turn them down in speed but still push lots more than your average 120mm fan.
My whole system stays very cool even with 2 6800GTs overclocked and my PCI wireless card producing some monster heat... Both 6800GT's temps are around 65c at full load.
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