I was so excited to recieve my new 20" iMac today - I ordered it Friday night, and it shipped from China on Monday - I had figured it would take a few more days. At this point all I've done is open the box and see what's inside - including a Leopard dropin DVD. I was hoping that Leopard would be preinstalled, but since it is not, I would be grateful for advice as to the best way to install it. If there is an option to reformat the hard drive should I do that? Thanks.