As a group the Corsair Air Series of fans will definitely cover any fan needs for any user. There are three variations on quiet fans with varying airflow, static pressure and noise levels to suit anyone looking to keep the peaceful silence in their rooms and for the guys who demand performance; there are two options available to you. Being able to customize the color, even if with just the leading edge of the fan frame is something that borders on genius, even if now it seems so simple. There is no other fan on the market that I know of that can swap from ASUS red, to GIGABYTE blue or even ECS white, just as three ideas. No matter the base color of a build, even if the rings contrast, the look of a build after is taken up a notch, even past LED fans in my mind. The subtle pop of color added from these fans is something I see a lot of people gravitating to. Covering every fan with rubber on the corners and supplying not only the screws, but a 7V adapter for the 3-pin powered fans is also included with each and every fan.
Individually, there are in my mind only three of the five fans I would really consider, although the AF 140 QE and AF120 QE have their places in some buyers minds. The three I feel are the stars of this group are the AF120 Performance fan and the SP120 in both the High Performance Edition and the SP120 Quiet Edition. Since pricing is within a few pennies across all five entrants, I would personally pass on the first two I listed for the later three and here is why. The SP120 HPE is pretty self-explanatory, it is by far the best performing fan offered and the 35 dBA rating is overstated as the fans aren't that loud with 12V applied. These will work for anything from case fans, coolers or radiators as they will drive near 70 CFM of air into the device with 3.1mmH20 of static pressure forcing its way through.
In second place I would bring up the SP120 Quiet Edition. With near silence, this fan may only deliver near 40 CFM, but the static pressure level offers every bit of that 37.85 CFM is getting used. This is also a good fan for those demanding silence for cases, coolers and radiators. That leaves us with the AF120 Performance Edition that offers 63.47 CFM and static pressure levels of 1.1mm H20. This is the fan I would choose if I wanted the best of all things considered. Even with slightly elevated noise levels, this fan would be a great solution for cases and coolers, but I would move to a SP model for radiator cooling.
With the fact that you can buy Air Series Fans just about anywhere and the descent pricing even if just buying one at a time, Corsair took a well-placed step into the aftermarket fan segment. With the single fan price of $19.99 and the twin pack pricing of $29.99 you are going to be hard pressed to find fans that will offer not only the specs that these fans offer, but can also deliver that "pop" that custom PC builders look for. Now we all know there are $5 fans out there and on the flip side there are fans that top $30 apiece as well. That in mind, to customize your selection for the various components that may require different levels of fans, you can mix and match between all of the Corsair solutions and keep a singularly unified look unlike most companies.
For these reasons I really can't see any reason for you not to look to Corsair with any and every build not just because of the coolers, cases, power supplies, memory, SSDs and peripherals sections, but now also for the Air Series Fans that bring a new look to chassis design.