Let's say Apple came out with two options for the Macbook Pro. 1) current configuration, with HDD drive and superdrive. 2) replaced superdrive by a SSD that is used as the boot disk, keeping HDD in its usual place. The SSD is mostly for making the laptop faster, i.e. stores applications etc. Big files can be stored on the HDD. Superdrive comes as USB attachment. Probably $200 more than the superdrive option, depending on the size of the boot disk. Theoretically this would allow to make the MBPs thinner and lighter, but not as long as it's an option. Which one would you buy?