I purchased 27 inch iMac core i7 off eBay. It arrives tomorrow. Supposely it has a 3 year Applecare warranty with it. However after reading some post on AppleCare from eBay I would like to just purchased my own apple.com AppleCare for $120 from apple directly (education discount) which I am qualified to received since I am on staff at a major university. So can I re registered AppleCare even though this new new iMac already has AppleCare. I have read there could be eBay scams and people generating fake codes and sometimes apple doesn't notice it until after your one year is up. I would rather just pay for real AppleCare with the legal box and serial to protect my $2400 investment.