I think some of the mock ups posted look good and pretty much all have their merits.
Personally, I go with the wiz's rack concept. I think that offers the best way forward.
Apple could accomodate all users and third party hardware with that. Modular in a strong chassis that could be added to. Base model that can expand as you need, with a couple of higher end options. Even if they didn't go full width but went half that could still look great.
It would also clearly...