Looking to sell my Macbook Pro 15" from (Mid 2007). Ram has been upgraded to 4GB. Harddrive is 250GB. Everything else it the original hardware. Macbook is in very good shape, few minor scratches on outside case but nothing too bad. Battery does need to be replaced but it still holds a decent charge. What do you think I could sell this for so that I could purchase a new iMac? Thanks!