I am thinking about going with a SSD drive for my MB. I was going to add a 64gb SSD drive where my current MD is, then I was either going to replace my superdrive with a secondary drive (500gb), or just use a passport external. What are your opinions on that? And if I decide to go with the superdrive replacement, what is the product I need to do so? I remember reading it here, but I forgot the name of it. And is it that difficult to replace? Thanks for the help!