I am new to mac and would like to buy a used G5 to learn about them. I have a pretty good background with pc's and currently work in a windows environment. I have searched around and it looks like the best deals are on ebay. I can get a G5 tower with modest components/software for about $500. I am not worried about shopping on ebay but is there a better (cheaper)place to buy from? Also where can I learn about installing and configuring the os and other software? Thanks.