The 4 brands of fans I tend to recommend, most of which are PWM (if I remember right -- could be wrong) are:
*
Noctua (personally used 120mm, 92mm, and 80mm)
*
Nexus (personally used 120mm and 92mm) -- these are supposedly rebranded/slightly-modified Yate Loon fans
*
Scythe (personally used 120mm and 92mm)
*
Yate Loon (personally used 120mm)