DDC TOP poll: what TOP do you use with your Blue impeller DDC

[Waterlogged]

Zern P12 - quietest top that i know, followed by Koolance PMP400 (old metal version) or the Phobya Metal Top

EK and Watercool Tops are much louder !

http://www.youtube.com/watch?v=Z541Ri87TMw

http://www.youtube.com/watch?v=HX3wynmQxKk

http://www.youtube.com/watch?v=v4os7Kv2lNg

http://www.youtube.com/watch?v=dPLsZqarZUo

Are these tops you actually use or just tested?