Those evercool aluminum fans...

[Turbokeu]

My personal favorite

*edit - Papst 4412FGLs if you want silent

Panaflo M1A, my favorite too...

After hearing all the good critiques on the Papst 4412FGL I bought one.
Very silent (even @ 12V) but it doesn't move much air, so I'm sticking with the Panaflo M1A...

CD

 

[Turbokeu]

the alum fans are much quieter than the panoflos..whats with the panoflo fanboyness they have discernable motor noise the evercool doesnt

The only thing I can hear on my three Panaflo's is the whooshing sound of the air moving (thanks to their "Hydrowave bearing").

Maybe you heard the "made in China" ones...

CD