I am posting this here so the Ahead programmers can see it.
I have been working on a project to measure codec quality with a computer. I know its been tried before, but I think people make it too complicated or give up to easily.
Nero AAC comes out the best on just about any bitrate. Here is a summary of the results:
You can read the paper at Correlation Comparison of 8 Codecs
Thanks for the great work guys.