I'm selling my 13 inch Macbook on Ebay, but I'm not exactly sure how much I should sell it for. It has a 150 GB hard drive, has 2GB of RAM, a NIVIDA GeForce 9400M graphics card, and has Mac OS X Snow Leopard pre-installed. It's also in pretty good condition, with only a few minor scratches. It's only like a year and a half old, and I bought it then for about $1000. How much do you think I should sell it for on Ebay?