Corsair H80 is a good option if you can't have a big heatsink. It will provide performance similar to the D14 or Silver Arrow.
If you want to go with an air cooler, the Noctua NH-C14 is quite good. Not as good as a D14, but it's no slouch.
For all the people saying the H80 will easily dethrone the D14 or SA, look @ this quote from the Corsair rep on OCN, CorsairGeorge. The H80 is a good product, but we have to keep expectations realistic when comparing it to much larger air coolers.
Edited by 996gt2 - 7/26/11 at 10:25am
Originally Posted by CorsairGeorge
There are a lot of truths in the original post. I'll say this perfectly clearly.
The laws of physics are pretty strong, and when it comes to heat exchange, a giant 3lb hunk of copper and aluminum has a huge headstart over something half its mass.
The H80 performs similarly to the D14 on the Balanced mode, and is just a little bit louder. But it has a few other benefits. It fits in just about any case. It doesn't overlap your RAM slots so you can use any memory you want. It takes up less room inside the case so you can still work around the CPU socket. And it doesn't put all its weight on the CPU socket, where it could damage the motherboard during shipping or possibly cause microfractures in the PCB causing difficult-to-pinpoint stabilty issues.
No product is perfect for everyone. But the sales of the Hydro series speak for themselves - a lot of people don't want giant heatsinks in their case if they can get similar or better performance from an all-in-one watercooler. So I think there's enough room in the market for us and the other guys.