Music Isolation Software

Want to start off Music Mixing, and re-editing? Need some simple stuff, under £70?
I just got a new mac book pro, with snow leopard, and have been using GarageBand, to do a little bit of re-editing of some of the songs i have in my itunes library, and am wondering, if there are any products, with a beginner-friendly interface, but with more advanced tools than GarageBand, under £70 please? (Hopefully with vocal isolation software)
Thanks in advance!
To isolate the vocal from the music – no..
That’s only possible with the original multi-track studio recording.
Audacity is a free multi-platform, multi-track audio recording and editing app.
http://audacity.sourceforge.net/ (select “other downloads”).
Lame if needed to encode to mp3:
http://lame.sourceforge.net/
How to install Lame:
http://audacity.sourceforge.net/help/faq?s=install&i=lame-mp3
Basic tutorials:
https://wiki.brown.edu/confluence/display/CISDOC/Audacity+Tutorial
http://www.guidesandtutorials.com/audacity-tutorial.html
BlueAnt Z9 Bluetooth Headset Brings Voice Isolation to Life