AIO - all in one coolers, like the X62, H115i, CLC 280, etc :D
I have only built one system with older Corsair H110, and that was loud as hell. But a friend recently bought the Kraken X62, and I was very surprised at how silent it can be, if you don't push the fans to max. So going from 240mm radiator (like H105), to 280mm (like X62, H115i, CLC 280), might allow you to run the fans slower and get less noise ;)
As usual, I'd say just get the one that has the best local warranty for you, or good manufacturers warranty.