I always say it's the last iteration of my NATX, but somehow it seems that new coolers always find their way into the case.
In the recent months, I tried a Maidu 10 heatpipe cooler at 75mm tall, the old AXP100 C65 Full Copper, added another two 4mm Noctua's at the bottom.
Yesterday, the another cooler: the Noctua L12S x77. And it's better than the rest.
On a side note, my ATX boards fits the L12Sx77 with a 25mm thick fan underneath, very tightly.