Which fan(s) to use ? Want peace and quiet

[Seirrah]

I'm currently messing about with my pc in order to lower it's volume.

I've got my Zalman flower on the slowest speed that the variable resistor will allow.
I previously used four case fans and I've recently been using just the two, and input past my hard-drives, and an exhaust below my psu.
I think I may need to just remove one of these fans, as lowering the CPU fans speed didn't help too much. If I was to remove one fan would it be best to remove the front fan or the exhaust ? ...or does it not matter one bit.

Any other suggestions to improve the noise is most welcome!

Thanks

 

[Logsi]

Ill tell you what i did.

Bought 2x 120mm Akasa Ambers (Ultra Quiets) 2x 80mm Akasa Amber (Ultra Quiets)

And a Fan Controller!

Now my system is very quiet! The Fan Controller is very handy!