I have a MacBook Pro from June. I've upgraded the memory and hard drive, so I spent roughly $2400 for the machine. I have a buyer lined up for about $1700. So, I'm looking at the base 15" and the 17", $2200 and $2800 respectively. The real difference is the screen and some extra hard drive space in the 17". I don't care so much about the video or super drive speed. What would you do? Would you spend $500 or $1100 to upgrade to the new Core 2 laptop? Is the 17" upgrade worth the extra $600?