140mm fans

i'm going to do a build in the 350d and i am looking at getting an ekstra 140mm fan in the front, but which one?

The corsair af 140mm with led is 10$,

the corsair af 140mm without led is 15$,

and the Noctua NF-A14-FLX is 20$.

Which one should i get?

I have a 400r and I am going to be buying some of the Noctua fans soon for my build. From what I've heard the Noctua fans are very quiet and work well. 

but is it worth double the price from a decent quality corsair?

it think i'll go for the corsair with led for the cheaper price, and estetics.

For just case fans you're probably fine with the Corsair fans. I personally use all Noctua in my build (save for the 2 x 200mm one in front and one in the side) and love their silence and efficacy. I think if you are using a fan controller for your case fans though you should be able to keep the corsair fans plenty quiet.