best and cheapest 140mm fans?

Baumy15

Reputable
May 12, 2014
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ive got an aerocool DS cube case and i really need some extra airflow for my 280X.
ive got a bitfenix spectre pro 200MM fan in the front 2x coolermaster sickle flow x fans in the top and a coolermaster jet flow in the back, aswell as the stock NH-D14 fans on the cooler.

so im looking for 2 new top fans 140mm (intake or exhaust? which will be best?) a new exhaust (high CFM and mmH2O) and a 2x 120mm fans for the NH-D14.

the cheaper the better, and sound isnt much of an issue aslong as its not as loud as a coolermaster jetflow on 100%
MUST be avaliable in australia and prefer pccasegear or newegg australia. thanks:)