you could use a swiftech...those seem to be REALLY good for OCING.
as far as noise is concerned...you are typically going to increase the noise of your computer when you increase the speed of the processor past stock....its just assumed...(that is unless you go all out and swap to watercooling, which is NEAR silent a lot of the times).
get the case air moving good, by adding fans, and making sure you are at least in compliance with AMD's specs for building a system, intake fan bottom front, and exhaust top rear. that way, you know you have some circulation in the case. then, with whatever heatsink you chose, not only are your temps going to be lower, and the life of the processor increased, but (if you chose an overclocking heatsink) your overclocking limit will most likely not be heat. unless of course, you are running it really high voltage, in which case you will have heat problems unless you go swiftech and delta screamer...which you obviously dont want.
but there are some really good heatsinks out there, that will keep that chip cool.
thermalright AX-7 comes to mind...which can be really quiet.
alpha pal 8045 is another favorite
and swiftech mx6462 (there is a new one, i cant remember the number, but looks NICE).
first, get a good heatsink. then a good fan (unless it came with a good one already). then increase the case airflow to refresh the air as fast as possible to keep the air going into the heatsink as close to room temperature as possible.
then, keep your room as cool as possible.
remember, the heatsink can only be as cool as the room temp allows
-DAvid
-Live, Learn, then build your own computer!-