ya, I also find that the Medela Mini is very very noisy..
you might want to consider getting "Calypso Breastpump" by ARDO. It has a upgrade set available to allow dual side pumping. When outdoors, it can run on 6 X AA batteries also. I also feel that I had better control over the vacuum suction with this pump as compared to the mini. It also allows you to set how fast you want the pumping action to be.
I bought the pump for $300++ (including the upgrade set) March/April last yr @ United Square, not sure if the price is still accurate
I can pump a higher volume of breast milk using the Calypso pump vs Medela Mini...