Just to ensure you have it all clear.
SP120 Quiet(1450 RPM) is a slower thus quieter static pressure fan. The static pressure is down to the very wide blade design.
SP120 High(2350 RPM) Performance is a faster high static pressure.
You want these for things like hard drive bays(with drives installed), heatsinks and radiators. They are most likely better with filters than the AF120's as well.
AF120 Quiet(1100 RPM) is a slower high air flow fan
AF120 Performance(1650 RPM) is a faster high air flow fan.
You want these as intakes and exhaust as long as they are not overly restrictive.
AF140 is a quiet(1150 RPM) high air flow fan designed to move lots of air with minimal noise.
Corsairs fan specs can be found
here