Hey guys, I have an early 17" 2011 MBP (2.3ghz i7, 8gb ram, 512gb SSD, 1TB Optibay) and I'm just curious about when and where you guys go to sell/upgrade your MBP's when the time comes. I've decided I want to sell and upgrade when a major new upgrade comes to the MBP's instead of testing to see how long I can make my setup last. What is the most reliable way to sell when the time comes, and how much do you usually end up spending in the difference cost of selling and buying a new setup? I know there's no way to tell the future, but typically new models come in at around the same price as past years. Thanks for your input!