Hi, I was interested to know how much I can get for my macbook pro if I were to sell it. It is the october 2011 model, 2.4ghz processor, and then standard specs for everything except it has a hi-res screen. I have tried looking for a similar one on ebay but I can't find one similar. I was just wondering because if the new models have retina displays, I would consider upgrading as I would benefit greatly. Thanks