Okay so I'm wanting to buy a MacBook Pro now (I know new ones are coming out in the fall) and I'd like to know where I am gong to get the most bang for my buck. I'll be using it for music production but nothing too intensive. It doesn't have to have a retina screen but I'm trying to figure out how much better the retinas are over the non retina models. I'm absolutely capable of replacing ram, battery and putting a new ssd in or replacing the smaller flash hd with a bigger one. I found a used mid 2012 15" 2.6 quad core with a glossy screen for $900... Is that the best I'll get for the price? Is it worth the extra money for a retina at my price range? (My max is 1500 when its all said and done) Thanks in advance!