If you've done minimal research on PC Components, you've heard of Noctua's fans. They have good reviews and good specifications but they're a bit more costly, especially if you need to purchase six or more of them!
They've listened and provided a nicer on the wallet, entry level option! I personally opted for these ones as the color suits my build a bit more, I don't care about noise, and they can still move air well. Hardly noticeable at an idle speed, these things seem to move a reasonable amount of air. It's not often when my computer requires them to ramp up the speed a bit, and when they do the temperatures drop quickly.