apparently noctua is coming out with black colored fans now. I would get those. I have the Corsair SP on my rads and they are a bit loud. NoiseBlocker fans also come highly recommended. Yate loons are another brand that I was looking at for my build.
If you want cheap, reliable and move a lot of air - Cougar fans have worked really well for me. 4 x 120mm fans for $20 when NCIX has a sale. Work awesome. They are NOT PWM fans if you are interested in that sort of thing.