I recently found a list of fan specifications that compared 30 different 120mm fans with regards to air-movement (CFM) and noise-levels (dBA). There was a lot of good info on there, but nobody had really broken down the list as far as a ratio of air moved per decibel of noise. Sooooo me being the spreadsheet guy I am did it myself. Among the 3-pin 120mm fans, Nanoxia was not the absolute top of the heap, but it was really close. Additionally, when I took that same info with regards to the ratio of noise per air movement, I created another ratio dividing the price by my previous ratio.
What did that leave me with? A list of all fans that were the best bang for the buck as far as noise generated from air movement. Nanoxia Deep Silence fans were FAR AND AWAY the best on that list. For the money, these are simply the best fans you can buy if you're wanting to move a decent amount of air and keep your noise levels down.
Nanoxia nds140-1800 deep silence 140mm 1800rpm fan