I need help figuring out a reasonable selling price for my 17" MBP. Here are the specs: MacBook Pro 6,1 17-inch, Mid 2010 2.66 GHz Intel Core i7 8GB 1067 MHz DDR3 Intel HD Graphics 288 MB NVIDIA GeForce GT 330M 512 MB ST9500420ASG 500GB 7200RPM HDD Glossy Hi-Res Screen I'm selling cause I want to upgrade to a newer retina MBP, I just don't know what a good selling price for this machine would be. Any advice as to where I could sell it and make the most from it, and what to offer it for? I actually have a potential buy who's a photographer, and I just want to make sure we are both getting a good deal. Thanks.