What would be a good model/year to look for if I am looking for a retina 15"? see some 2012 models and I saw one 2013 for 1200, but it had a couple issues. I am in no real hurry to buy, I'd rather wait until i find a killer deal and jump on it with cash. I've ben trying to keep track of what models are good, which have problems, but its all a blurry mess after several hours of research. What model/year should I look for and what would be a good (but not impossible) deal? Thanks all!