I have had good results with a couple of copper coolers.  One is made by Galaxy, the gnx80 I think.  Also the Thermaltake volcano 10+ did really well.  I haven't been pleased at all with stock coolers, orbs or coolermaster.  My next AMD cooler for my 2500 barton will be the SLK 900a with a Panaflo 92 mm fan and an adjustable fan speed controller.  LIke you, I'm looking for quiet.  My volcano 9 ain't it!!
Don't forget to post your results here so we can learn from your investment.
Gravity