What's the quietest decent 80mm fan?

[MrWhippy]

looking to add a couple of fans to a case for a mate, see if we can get his temps down a bit.
his case has a 120mm extractor at the back but unfortunately will only mount 80mm fans at the front to suck air in.

myself, i'd suggest a new case, but he's a bit skint so this is worth a try for now i guess.

so, if you were buying a couple of 80mm fans for air intake, which ones would you get?

ideally, the quiter the better.

cheers...

 

[MrWhippy]

cheers for the replies, i'll look into those.

hadn't thought about adapting a bigger fan, that might be worth a look.

guess i'll have to get a good look at his rig and see how much space there is.