I'm currently looking at running just a single K16. Has anyone given any thought to using a wall wart with a Molex connector (e.g.
http://amzn.com/B002TJNDU4) and running it through a molex-->pcie adapter? Are there any reasons why that wouldn't work? I would love not to have a large, exposed power supply if I don't have to.
Take a look at this little guy:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817129006Fanless, and enough for a K16 plus a rPi, for only $5 more.