I have a late 2010 13'' MacBook Pro (specs in sig) and I was wondering what I could eventually upgrade? It has the NVIDIA integrated 320M graphics (not in sig) which I am assuming are not upgradeable. I could be wrong... I do not know much about laptops in general so I would like to know if anything in my model is upgradeable or is ideal to upgrade in the future of my ownership of it. Thanks.