Don't expect better quality than lame-vbr at a decent bitrate. Mp3pro seems to target the 64-96k range and doesn't show any better results at higher bitrates under initial testing. Here are some other links regarding mp3pro vs wma vs mp3 sound tests :

http://fastforward.iwarp.com/mp3pro_opinions.html
http://fastforward.iwarp.com/tamsjam.html

-Kit