What I gather from all the various posts in the forum is that the up-to-date program gives users an upgrade DVD that requires a Tiger installation to either upgrade or clean-install to Leopard. 1.) Does that mean if I need to reformat my computer a year or two from now, I have to downgrade to Tiger and then upgrade back to Leopard? 2.) Do the Macs come with the retail version of the OS X DVDs? (ex. Tiger retail DVD, Leopard retail DVD). Or have they only ever come with restore DVDs? Thanks!