CPU Cooler for an FX-55 San Diego

the stock cooler? i got one sitting in front of me and its pretty damn quiet.
Nothing wrong with it if you are running at standard speeds. And you didnt say if you were overclocking or not!

If you plan on overclocking the bejebus out of it, then by all means get a better cooler.

For quietness & performance you cant do much better than the Thermaltake Big Typhoon. Just check that it fits.
Also many of the other heatpipe equipped coolers have similar levels of performance.

Well, there are a couple of options for you.

They are:
SI-120,
9500,
and the (big) Typhoon.

You best bet would be the SI-120 as it offers as good as cooling as the others, but is easier to install. You would also need a fan for the SI-120 so choose a low noise and high CFM fan, which are pretty easy to find since the SI-120 uses a 120mm fan which are generally always quite enough and move plenty of air.
Even on a lower fan setting the SI-120 would still offer really good cooling.

Just make sure to use some Artic Silver 5 too. The temps will magically drop as it gets broken in.

BTW Thermalright make the SI-120. Zalman the 9500, and TT the (BIG) Typhoon.

-dragonx