HELLO I AM THINKING ABOUT UPGRADING MY MACBOOK PRO MODEL A1211 TO THE FULL 3 GB OF MEMORY AND UPGRADING MY HARD DRIVE TO THE 500 GB IS THERE A HUGE DIFFERENCE BETWEEN A 500 5400 AND A 7200 INTERNAL HARD DRIVE ON A MACBOOK PRO ALSO IF I AM GOING TO UPGRADING MY PHOTOSHOP CS4 ON A MACBOOK PRO AND APERTURE 2 SOFTWARE WOULD IT WORK THANKS ALOT FROM JEWELL BUNHC III