I was hoping to get so direction from the pros on a realistic model range I could get for around $500.00. I am open to a 13 inch, but would rather have a 15 inch. My wife currently owns a 2012 non-retina model and I love it. I currently have a very used white Macbook and I don't believe its worth repairing and upgrading as I also have a 2006 Mini that I want to donate to Goodwill. So my plan is to run my MB as a desktop with a KB, Trackpad and monitor. Then buy a new used Pro as my mobile unit.