Nice, the NUC should've been passive from the start, using a fan on a 17W TDP is kind of ridiculous especially with an external brick for AC/DC. (internal DC/DC can be very efficient)
I wonder about the price though, silverstone's stuff can be pretty expensive.
For a rough idea of comparison when they list their MSRP, a fair bit larger hunk of machined metal in the akasa euler (35W+ passive case for thin itx) is under $100 in US now, and its a low volume specialty case.
Nearly dead silent HTPC ver 2.0: i3-4340 w/ Noctua NH-L9i on Z87E-itx inside CM130 elite, fanless PSU, SSD OS drive
SAN shares via 40GbE tunneled over 56Gb infiniband links
microcenter & ebay = severe risks to my wallet