I am in need of a new laptop. I am looking at purchasing a MBP 15", but not sure how to configure it. I am thinking 2.53 GHz, 320gb serial drive @7200, and 4gb sdram. I work as a graphic designer, so I typically run many of the adobe suite applications: photoshop, illustrator, indesign. Does this configuration sound right or should I go with something different. I don't really understand GHz, or 5200rpm vs 7200rpm, so maybe I have to little or not enough of something. Any advice would be great. Thanks.