I always like Scythe fans. The Gentle Typhoons are nice quit fans. For raw performance, the Kaze series is good. For insane performance, buy 38mm deltas. You can get a fan controller to deal with the noise. At 4500 RPM, they sound like a plane. At the nob turned down they are actually not bad. The 25mm (standard 120mm fans) they are still great fans. I think you can get them from 2,000 RPM to 5,000 RPM. They are dual ball bearing and last forever. Buying used on Ebay is not a bad option.
Also, Nocturas are awesome with radiators, but they cost an arm and a leg. For the money, I think deltas are better. If you want quiet, then go with Scythe Gentle Typhoons. With a fan controller you can gen high RPM ones that run absolutely silent at low when you are watching movies or web surfing, and then you can max them out when you are playing games. Even at max they are really quiet.