I've got an old Macbook Pro 13" 2009 that I'm looking to sell. Its the 2.53 ghz version with an upgraded 8 gb memory. Newest OS X and Office 2011. Battery still has modest charge (5 hrs), and the laptop has minor physical usage damage (small scratches and a small dent). Most of the automated price estimators give it around $250 - $300, but I've seen people selling the lowered models for up to $500 on eBay but I couldn't find the average sale price. I was mostly wondering with the addition of things such as 2.53 ghz, upgraded memory, and software (I've also got an old copy of Adobe CS5.5 that I could add), how much could I ask for the laptop?