You could buy a high-end heatsink, such as the SLK947-U or maybe even the SP-94 if you can afford it, along with a fan like SmartFan II, whose speed can be manually adjusted. This way, you could get the same results as the stock HSF but by operating the fan at lower speeds.
For example I have an Athlon XP at 1.65v vcore voltage and I am using a SLK800 with SmartFan II. I have the fan's speed set to 2500rpm which is almost silent and I have never exceeded 47C load.
<b>blah:</b> <font color=red>Don't show your stupidity, whole world knows that Intel is a much better CPU for stable work.</font color=red>