I'll be buying a new 27" iMac next month to replace my mid-2007 model. I wanted to ask a few questions and see what those who are tech savvy do when they buy a new computer. Me: Very basic user. I just browse, read the news, watch YouTube (make a video now and then), and watch movies on sites like Primewire. I don't play games or download books/music/movies. Most Important: Speed and security from nosy, info-mining companies. I use Firefox and the only add-ons I use are: AdBlock Edge Ghostery WOT Hola NoSquint Does anyone use NoScript? Too many? Not enough? Got another recommendation? What do YOU do when you get a new computer? Are there certain precautions you take, or extensions/add-ons/software that you consider must haves and download immediately? (Like any Mac "cleaning" software or security programs?) The only info I'll be transferring from my old iMac are a few documents and pictures. Easy enough to put on a thumb drive. I keep nothing important on my computer so backing it up first isn't a concern for me. Extended Warranty? I bought the extended warranty for my current iMac and never needed it. Should I get it on the new iMac? Refurbished? Are they worth considering or do they usually come with headaches? Lastly, I want to completely wipe my current iMac clean, do a clean re-install, and give it to a single mom friend (who is also a basic user). Once I wipe this computer clean and re-install, it will re-install Snow Leopard again. How do I get it back up to Yosemite? (I had to purchase one OS in the meantime. Will I need to purchase it again, and install each OS in progression like before?) I would really appreciate any advice on how to securely clean this iMac and get it ready for my friend.