Wondering if I should purchase a refurb Mac Mini from Apple, or pick up this one I found locally on craigslist. Is there much difference between the Mid-2011 Mini and the 2012 model? craigslsit- for $500 Mid 2011 Apple Mac Mini 2.3GHz Core i5 4GB ram 500GB HDD Includes MacBook Air external SuperDrive, Wireless Magic Mouse, Full Size Wired Apple Keyboard, and Matching Logitech Z4 2.1 Speaker System. OR Apple.com refurb $509 Refurbished Mac mini 2.5GHz dual-core Intel Core i5 Originally released October 2012 4GB memory 500GB hard drive Thunderbolt port (up to 10 Gbps) HDMI port supports multichannel audio output Intel HD Graphics 4000 Or, I could spend a little more and get the refurb above with 1TB HDD and the i7 Core for $679. Wondering how theses machines compare performance-wise... seems like craigslist is the best deal, but the Mini is older and has no warranty.