I'm in the market for a used macbook and an on a budget. I can't find the exact machine I want so I have a question. The two configurations I can find at the price I can give is a core duo with a superdrive or a core 2 duo with a combo drive. Which do you guys think is more important, the upgraded c2d processor or a superdrive with the old cd processor? Of course I generally get more RAM and a larger hard drive with the c2d as well, but both are easy to change and can be done later if I go with the core duo machine. Thanks for your input!!