So, I have a bit of a dilemma. I recently purchased a brand new 13' Retina for about $1500. However, someone recently offered me a '15 Retina for $1400. Now, I've done research and have seen the benchmarks and what not, but the idea of a used computer bothers me. He did tell me it was basically spotless but I would not be receiving the charger, which is sort of sketchy... Opinions?