I'm about to replace my mid-2010 21.5 iMac, and am wondering if there is any real reason NOT to buy a refurbished 2013 model, and save a couple of hundred bucks in the process? From what I understand refurbs come with the same warranty, etc. that a new one does, that you MAY stand a better chance of getting a defect-free machine since it HAS been refurbished, and that, basically, the only difference is that you don't get the pretty white box. Am I missing anything? I am good with the base model, as my current one is/was, the only upgrade having been my adding 4 gigs of ram to bring it up to it's current 8 gigs. Thanks.