*** Yeah I use exactly the same method as well....
Mix to your standard WAV 16 bit / 44.1
then convert to Mp3
and I also use at least 192 or higher.....
I have found in the past 128 give all kinds of artifacts...It drove me carzy....or at least more over the edge that I already am....so if you are going to email it out 192 is a happy medium between better quality and mail-a-bility....
but if I am going to just keep it around then I will go for 320
Clifford