I love the NH-L12 solution but, I was able to find one cooler (the Raijintek Pallas) which could best it and add some needed overclocking headroom. Unfortunately, the cooler and 13mm fan seem to total 68mm. It would be an incredibly tight fit at 153X150X68 vs the Noctua's 150X128X66 but, a little sanding and some manufacturing tolerance wiggle room might allow it.
What do you think?
Don't count on any manufacturing tolerance wiggle room form our side
Knowing and owning the Raijintek Pallas cooler, I can guarantee that you can quite simply bend it down a little bit to a height of 65mm. This of course assumes that the cooler clears the RAM one has. This of course would mean that the fan blades would be too close to the outer shell if used in a pull config, and can create some noise. However, this can be remedied by reversing the orientation and have the fan exhaust: and my belief is that this would also lower the temps...
I believe this cooler would simply be the best air cooler to be used in this case...
I can try and take a photo if anyone is interested.