As my PMG5 died some time ago, I want to replace it with an iMac. I already have an external HD for Time Machine which was connected to the PM by FW800. I'd like to also do this with the iMac, but seeing how the new laptops began to drop FireWire, I'm not so sure whether waiting for the new models makes sense. The HD also has USB 2.0, but I'd prefer FW800 if I can. So what would you do?