For the NB, I've heard the posted Thermaltake Spirit 2 is good as well as the Noctua and Thermalright.
I have the thermalright HR-05 SLI and a 20db Hyperx 80x15mm fan on mine, it still pushes like 20cfm of air and the fan is easily replaceable, that's why I went that route. Also the SLI has the ability to slip udner other obstacles, It worked fine with my air cooler, I just had it pointing down.
This is my HS:
and my fan:
My MCP temps went from 51C stock to 35C, so they work really well and completely silent.