I was so saddened to learn that the 21.5 imac only has one firewire port... it seems like that would make it unusable for music production. The current models are more than powerful enough, but not being able to run an interface (apogee duet) and external drives at the same time is really bad... I considered using a hub, a powered hub, but I'm worried that it will cause real problems with latency... I'm hoping hard that the newer models will contain more ports... even ONE more 800 would do it for my purposes... any thoughts? anyone know if a powered hub would cause a slower response, IE (no pun intended) more latency?