I would get that Noctua fan if it was black. But its brown so sorry.
I might get 3 of these though for the front:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835610006&cm_re=nexus-_-35-610-006-_-Product
Black frame with white blades.
it isnt brown, its like a dark pink lol
basicly its a horrible colour, i have no idea why they made it that colour really but they push some good statictics
if i was to buy some fans again i prob wouldnt choose them because of there price, but i cant knock there performance
them fans do look good, they are not bad for price-are you going to use them just for case fans?
EDIT
if you are using them for liquid cooling and you want fans for cooling the radiator, you wanna be looking at static pressure aswell not just cfm
but im sooo drunk i cant give you statistics or guid you, bomberboysk is the dude to ask