I'm decided on the Mac I want to purchase and will order it via the Apple store online. That said, I don't need it right this instant so I was wondering if there is any advantage to waiting and purchasing with ML installed? Apple will upgrade for free, I know. Is there any leftover cruft from an upgrade I don't need or any other issue where it would be advantageous to wait a couple weeks. I can't think of anything but am simply curious.