If you can afford it, try the Noise Control Silverado. It’s the next best thing to a water cooler. It’s very quiet, comes with every component you can need (including several power cables to run at several speeds), and it’s extremely efficient.
Just remember to turn the BIOS fan speed alarm off… I couldn’t boot after installing it until I had the cooler running at max speed, because the suggested speed for my CPU is below 2000 rpm, so the BIOS wouldn’t let my pc post since it detected a faulty fan.
Don’t worry about the low speeds… the cooler has a silver CPU contact (better heat dissipation than copper), and two huge reactor-style fans in counter-rotation, so it displaces a massive amount of air. It took my cpu temp 10ÂºC below my previous cooler, which ran at 7500 rpm and made more noise than my vacuum cleaner.
Of course… water cooling is still the most effective, and disregards the temp inside your case, if you install the radiator outside the case… It’s my "next big step"tm