I just picked up an iMac G5, and never having owned one before, I did not know what I was getting.  That being said, I now need to figure out what my options are for updating a few programs.  I will mainly be using this to surf the web, but would like to be able to share itunes and put movies on it. It currently has itunes 4 on it, and I am not sure what version I can upgrade to. It is running Safari 3.0.4 and would like to update that as well.  I tried to put firefox...