Best 80mm led fan I have used is the CoolerMaster "rifle bearing" models.
They have plenty of models @ svc.com.
As to the 120mm models, there is plenty of debate there.
Here is one that comes recommended from silentpcreview.com.
http://www.mnpctech.com/Globe.html
I haven't used these myself, but have 2 of them under the Christmas Tree for my son.
I will see soon how much better they are than his stock Thermaltake 120mm craptastic fans.