BG: I'm about to buy a MBA, and will need an optical drive to go with it. This will need to be a BluRay Burner. I actually like the idea of an external drive because then I can share one drive among all my computers. I've been waiting for external burners to really hit mainstream, but that hasn't happened yet. It's only now that internals are becoming easy to find. Because I have a lot of store credit, I'd like to get this from Best Buy, but they only have internals in stock. I've contemplated getting an internal and using an enclosure, but I'm not crazy about the idea. Opinions?