OK, so I've decided on the 15". I was going to get the 2.66 with the better graphics card for $1984 with student discount, the only upgrade being a 500gb 7200rpm hard drive. Then I started thinking, I can get a 500gb 7200rpm hard drive for about $120 to $130. Could I get the NVIDIA 9600 graphics card to put in too? I wasn't sure. I know installing the hard drive is very easy but I don't know about installing the graphics card (or if I can even get it, or if it will even work), so I come to all of you for your wisdom. Thanks in advance for your responses.