A good and silent (a silent server is nice) heatsink is the Scythe Ninja coupled with a Yate-loon. http://petrastechshop.com/spdeco.html
You can choose a lot of Scythe coolers w/ fans from that site. Its a great site. I highly recommend them for watercooling and heatsinks. As they stock things whatever enthusiasts say that are good.
You cant go wrong with them.