Which fan controller and why?

[Dodger]

If I decided to get a fan controller, which one should I get out of these and why?

http://www.overclockers.co.uk/showproduct.php?prodid=CA-072-BX

http://www.overclockers.co.uk/showproduct.php?prodid=BB-001-ZA&tool=3

http://www.overclockers.co.uk/showproduct.php?prodid=BB-001-NX&groupid=701&catid=2331&subcat=189

http://www.overclockers.co.uk/showproduct.php?prodid=BB-000-LP&groupid=701&catid=2331&subcat=189

http://www.overclockers.co.uk/showproduct.php?prodid=BB-002-LP&groupid=701&catid=2331&subcat=189

http://www.overclockers.co.uk/showproduct.php?prodid=BB-007-ZA&groupid=701&catid=2331&subcat=189

 

[Dodger]

I will only be controlling one fan per channel so the Zalman I picked should be okay