Im moving my Computer down to the floor on little shelf and since its going to be a little farther away from me i thought i might as well put some new Case fans in there that could cool it really nice since it gets a little hot. Im using a Fractal Design R4. I want to replace the front 2 fans and add a fan either on the side or on the bottom to push more air in, I don't really care for loud fans as long as they push/pull a lot of air in/out of my case to cool it as much as i can.
I have always been partial to Noctua fans. For 120mm I like the Noctua NF-P12's and for the 140mm the NF-P14 is pretty sweet. They move lots of air and even at max speed are fairly quiet.
I've always been partial to Corsair and Cougar for case fans.
NZXT makes half decent ones too.
A little expensive since i want to add maybe 4 fans, but i have been looking at Noctua fans ever since i got my PC.