Hello! I recently bought my first mac (MacBook Pro 15'') and I am very happy with it. At the time, I decided to go with the 120GB hard drive, but I am coming to a realization that the disk is filling up quite quickly! What are my options? Could I upgrade and replace the hard drive myself? What are some of the good stable drives out there that are not too expensive. I am looking for something in the 200-300GB range and preferably 7200RPM. Thanks!