Airflow help? :)

[imanooob]

Hi.
I built my first computer yesterday, and so far everything is functioning properly, but first, I have a few questions regarding airflow.
The case that I got was the CoolerMaster HAF 912, which comes with 2 stock 120mm fans. Is this enough to cool my system? Whether these are enough to keep my PC cool, i don't care. I'm buying extra fans just to be safe.
Which of these sets of fans are better?

The links won't work properly.. but either way.. The 2 I'm comparing are both sets of 4 120mm case fans. One is $10, manufactured by Rosewill, and the other is $21, manufactured my coolermaster.

Please&Thank you

 

[MMM]

Hi.
I built my first computer yesterday, and so far everything is functioning properly, but first, I have a few questions regarding airflow.
The case that I got was the CoolerMaster HAF 912, which comes with 2 stock 120mm fans. Is this enough to cool my system? Whether these are enough to keep my PC cool, i don't care. I'm buying extra fans just to be safe.
Which of these sets of fans are better?

http://www.newegg.com/Product/Produc...82E16835103052

or

http://www.newegg.com/Product/Produc...82E16835200061

Are either of these sets good? If not, what would you recommend getting for my case?
Please&Thank you

Your links not working.... any fan will do but depends in RPM and noise factor should be your concern.