I have a late 2009 15" MBP. 2.53 processor. I was thinking about upgrading to a new i5 or i7. My only issues is when iTunes boggs down system. Other than that, it's media, learning programing and photos. Do I need to upgrade? I put a 7200rpm HD in it. Thinking about upgrading to 8GB of RAM. Should I save my $ and wait? What would be the benefit?