I have a 2010 MacBook that I bought Lion for and upgraded it to. Upgrade was perfectly smooth. I am thinking of selling it because I just bought a MacBook Air. My question is, to wipe it and prepare it for sale, do I wipe the entire drive and then re-install SL and then update to Lion? Or should I wipe the partition with all my stuff and then use the restore feature of Lion to do the re-installation? Thanks!