Looking at getting a 13" MPB to replace my aging Macbook. I am aware of the imminent arrival of the next gen next year, but still seriously considering getting a current gen. Anyway, I am debating between getting the 2.66GHz version with 4GB RAM and the 2.4GHz version with 8GB RAM. I already have a 500GB 7200rpm HDD which I will transplant into it. Some stage in the next year or so I will look into getting an SSD and optibay for it. I know that if I get the faster processor I can upgrade the RAM at a later date, but is the faster processor worth the money, or would I be better spending on RAM?