I am gonna be buying a new MBP in the next coming weeks, my previous one is still fine, I just want a newer one that will be better for my photography. One of my buddies says he'll by my old one. How much do you think I should sell it to him for? Specs: 15" MBP 2.4 GHz Intel Core 2 Duo 8 GB 1067 MHz DDR3 250GB hard drive He says that it is more than enough specs for what he wants/needs it for. WHat do you think would be a good price to ask him for?