as i told i bought the Arctic Accelero Twin Turbo II and its CHEAP and work like i don't know what, i don't hear it even when the fan runs 80%
and it cools twice as better then the stock cooler...
about the case fans i cant tell you exactly what to add and where i first have to take a look at the case,what case do you use?
and it would be great if you post some pictures to us